Question

A motor boat sets down a river at the same time as a raft and in the same direction

Answer 1

Answer:

Let solve this with a example

A man takes 20min to row 12km upstream which is athird more than the time taken on his way down stream .what is his speed in still water

Explanation:

let the speed in still water =Xkm/hrs takes 20min to row 12km upstream speed of u/s=36km/hrs.Also time taken for u/s is 1/3more than for d/sdistance cover in d/s will be more 1/3more.Distance covered by man for d/s in 20 min =12×(12/3)=16km so speed of d/s =48and x-y =36=x= 42km/ hrs