Question

a motorboat goes downstream and covers a distance in 4 hours while it covers the same distance upstream in 5 hours if the speed of the stream is 3 km per hour .find the speed of the motor boat in still water​

Answer 1

Answer:

Please find the attachment

Answer 2

Answer:

27km/hr

Step-by-Step Explanation:

Let the speed of motorboat be 'x',

The speed of motorboat in downstream = x + 3

The speed of motorboat in upstream = x - 3

Since, Distance = Time × Speed

Therefore,

Distance travelled by speed of x + 3 = 4(x + 3)

Distance travelled by speed of x - 3 = 5(x - 3)

Distance travelled was same so,

4(x + 3) = 5(x - 3)

4x + 12 = 5x - 15

5x - 4x = 15 - 12

x = 27

Therefore, the speed of motorboat is 27km/hr.