A motorboat in still water travels at a speed of 36 km/hr. It goes 56…

Question

A motorboat in still water travels at a speed of 36 km/hr. It goes 56 km upstream in 1 hour 45 monutes. The time taken by it to cover the same distance down the stream will be-

Accepted Answer

Option A. 1 hour 24 minutes. Answer & Solution Answer: Option A Solution: & Speed upstream & = ( 5613/4 )km/hr & = ( 56 × 4/7 )km/hr & = 32km/hr & let speed downstream be x km/hr . & Then speed of boat in still water & = 1/2 ( x + 32 )km/hr & 1/2 ( x + 32 ) = 36\,\,\, x = 40 & Hence , required time & = ( 50…