Question

A boat goes 40 km upstream in 8 hours and a distance of 49 km downstream in 7 hours. The speed of the boat in still water is
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Answer 1

Answer:

5

A boat goes 40 km upstream in 8 hours and a distance of 49 km downstream in 7 hours. The speed of the boat in still water is?

Keerthi Elango

Answered March 23, 2019

Upstream Speed = 40/8 (km/hr) = 5 km/hr

Downstream Speed = 49/7 (km/hr) = 7 km/hr

Boat speed =?

Downstream speed = Boat speed +Water Speed

Upstream speed = Boat speed - Water speed

Note : Always Boat speed would be greater than water speed, so that boat could move forward. If water speed is greater than Boat speed boat moves in reverse direction.

By using formula

7 = Boat speed + Water speed

5 = Boat speed - Water speed

12= (2) Boat speed

Boat speed = 6 km/hr