Pinky can swim 27 km downstream or 15 km

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Target Exam

CUET

Subject

General Test

Chapter

Numerical Ability

Topic

Boats and Streams

Question:

Pinky can swim 27 km downstream or 15 km upstream in 3 hours. What is the velocity of the current?

Options:

3 km/h

5 km/h

4 km/h

2 km/h

Correct Answer:

2 km/h

Explanation:

Let,

x = speed of the object

y = velocity of the current

Downstream = x + y

Upstream = x - y

So, Downstream speed = $\frac{27}{3}$= 9 km/h

Upstream speed = $\frac{15}{3}$ = 5 km/h

So,

x + y = 9

x - y = 5

So, 2y = 4

y = 2 km/h