Question

A race boat cover a distance of 66km downstream in 110 minutes, it covers this distance upstream in 120 minutes. The speed of the boat in still water is 34.5km/hr.find the speed of stream

Answer 1

Let the speed of stream be x kmph

While going downstream total speed=34.5+x

Distance=66km

Time=110min=11/6hrs

Now,

Speed=d/t

34.5+x=66/{11/6}

34.5+x=36

x=1.5