Trains Boats and Streams Practice Test 1 with solutions

Question : 32 of 40

Marks: +1, -0

A man can row 12 km/hour in a still water. He noticed that it takes him double the time to row upstream as compared to downstream. Find the speed of the current.

4 km/hour
6.25 km/hour
20 km/hour
6 km/hour
None of these

Validate

Solution:

Let the rate of upstream = x km/hour
Rate of downstream = 2x km/hour
Rate in still water =

{x+2x}/2

= 1.5x
1.5x = 12 km/hour
x = 12 ×

{10}/{15}

= 8 km/hour
Rate of current = 12 - 8 = 4 km/hour

Go to Question:

Prev Question

Next Question