Question

A motorboat goes downstream in the river and covers the distance between two coastal town in 3 hours. It covers this distance upstream in 4 hours. If the speed of the stream is 5 km/hr, find the speed of the boat in still water and the distance between the two coastal towns

Answer 1

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Answer 2

let speed of boat = x km/hr

now
while going to down stream speed of boat = x+5 km/hr

and that of against stream = x-5 km/hr

now , distance = time × speed

d = 3 (x+5 )

d = 3x + 15

also , d = 4 ( x-4)

d = 4x - 16

so ,

3x + 15 = 4x - 16

x = 31 km/hr