Ravi can row downstream at 9 km/h and upsteam at 5 km/h. Find the speed of Ravi in still water and speed of current.

7 km/h and 2 km/h
8 km/h and 6 km/h
7 km/h and 3 km/h
8 km/h and 2 km/h

Correct Answer: 7 km/h and 2 km/h

Explanation:

Given, downstream speed = 9 km/h
and upstream speed = 5 km/h
According to the formula
Ravi's speed in still water = (Speed downstream + Speed upstream )/2
= 1/2(9 + 5) = 14/2 = 7 km/h
and speed of current = (Speed downstream - Speed upstream)/2
= (9 - 5)/2 = 4/2 = 2 km/h.

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