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Class 10 > Learn Mathematics > A motor boat whose speed is 18 km/h in still water...
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A motor boat whose speed is 18 km/h in still water takes 1 hour more to go 24 km upstream than to return downstream to the same spot. Find the speed of the stream.

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Boat speed in Still water 18km/hour. So boat speed in down stream =( 18+X) km/hour ,boat speed in up stream =(18 -X)km/hour. Time in up stream – time in down stream =1 hour. Now 24/(18-X) - 1 =24/ (18+X) . OR solving the equation—X2 +48X -18×18 =0 , OR (X-6)(X+54) OR ...
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Boat speed in Still water 18km/hour. So boat speed in down stream =( 18+X) km/hour  ,boat speed in up stream =(18 -X)km/hour. Time in up stream – time in down stream =1 hour.  Now  24/(18-X)   - 1  =24/ (18+X)  .

OR    solving the equation—X2 +48X -18×18 =0  , OR   (X-6)(X+54)  OR   X=6 km/hour speed of stream                        

Boat speed in Still water 18km/hour. So boat speed in down stream =( 18+X) km/hour  ,boat speed in up stream =(18 -X)km/hour. Time in up stream – time in down stream =1 hour.  Now  24/(18-X)   - 1  =24/ (18+X)  .

OR    solving the equation—X2 +48X -18×18 =0  , OR   (X-6)(X+54)  OR   X=6 km/hour speed of stream                        

Boat speed in Still water 18km/hour. So boat speed in down stream =( 18+X) km/hour  ,boat speed in up stream =(18 -X)km/hour. Time in up stream – time in down stream =1 hour.  Now  24/(18-X)   - 1  =24/ (18+X)  .

OR    solving the equation—X2 +48X -18×18 =0  , OR   (X-6)(X+54)  OR   X=6 km/hour speed of stream                        

Boat speed in Still water 18km/hour. So boat speed in down stream =( 18+X) km/hour  ,boat speed in up stream =(18 -X)km/hour. Time in up stream – time in down stream =1 hour.  Now  24/(18-X)   - 1  =24/ (18+X)  .

OR    solving the equation—X2 +48X -18×18 =0  , OR   (X-6)(X+54)  OR   X=6 km/hour speed of stream                        

Boat speed in Still water 18km/hour. So boat speed in down stream =( 18+X) km/hour  ,boat speed in up stream =(18 -X)km/hour. Time in up stream – time in down stream =1 hour.  Now  24/(18-X)   - 1  =24/ (18+X)  .

OR    solving the equation—X2 +48X -18×18 =0  , OR   (X-6)(X+54)  OR   X=6 km/hour speed of stream                        

Boat speed in Still water 18km/hour. So boat speed in down stream =( 18+X) km/hour  ,boat speed in up stream =(18 -X)km/hour. Time in up stream – time in down stream =1 hour.  Now  24/(18-X)   - 1  =24/ (18+X)  .

OR    solving the equation—X2 +48X -18×18 =0  , OR   (X-6)(X+54)  OR   X=6 km/hour speed of stream                        

Boat speed in Still water 18km/hour. So boat speed in down stream =( 18+X) km/hour  ,boat speed in up stream =(18 -X)km/hour. Time in up stream – time in down stream =1 hour.  Now  24/(18-X)   - 1  =24/ (18+X)  .

OR    solving the equation—X2 +48X -18×18 =0  , OR   (X-6)(X+54)  OR   X=6 km/hour speed of stream                        

Boat speed in Still water 18km/hour. So boat speed in down stream =( 18+X) km/hour  ,boat speed in up stream =(18 -X)km/hour. Time in up stream – time in down stream =1 hour.  Now  24/(18-X)   - 1  =24/ (18+X)  .

OR    solving the equation—X2 +48X -18×18 =0  , OR   (X-6)(X+54)  OR   X=6 km/hour speed of stream                        

Boat speed in Still water 18km/hour. So boat speed in down stream =( 18+X) km/hour  ,boat speed in up stream =(18 -X)km/hour. Time in up stream – time in down stream =1 hour.  Now  24/(18-X)   - 1  =24/ (18+X)  .

OR    solving the equation—X2 +48X -18×18 =0  , OR   (X-6)(X+54)  OR   X=6 km/hour speed of stream                        

Boat speed in Still water 18km/hour. So boat speed in down stream =( 18+X) km/hour  ,boat speed in up stream =(18 -X)km/hour. Time in up stream – time in down stream =1 hour.  Now  24/(18-X)   - 1  =24/ (18+X)  .

OR    solving the equation—X2 +48X -18×18 =0  , OR   (X-6)(X+54)  OR   X=6 km/hour speed of stream                        

Boat speed in Still water 18km/hour. So boat speed in down stream =( 18+X) km/hour  ,boat speed in up stream =(18 -X)km/hour. Time in up stream – time in down stream =1 hour.  Now  24/(18-X)   - 1  =24/ (18+X)  .

OR    solving the equation—X2 +48X -18×18 =0  , OR   (X-6)(X+54)  OR   X=6 km/hour speed of stream                        

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