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10. A motor boat goes downstream and covers a distance in 4 hours while it coverthe same distance upstream in 5 hours. If the speed of the stream is 3 km/hr, findthe speed of the motor boat in still water.2 DA |
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Answer» Let the speed of the motorboat be X.speed of motorboat in downstream=x+3speed of motorboat in downstream=x-3since,distance=time x speedtherefore,distance travelled by speed of X+3=4(X+3)distance travelled by speed of x+-3=5(x-3)since distance travelled was same, so4(X+3)=5(x-3)4x+12=5x-154x-5x=-15-12-x=-27X=27 therefore, the speed of motorboat is 27 km/hr |
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