Staff Selection Commission Quantitative Aptitude — Question 72

Question

A boat goes 12 km upstream in 4 hours and 12 km downstream in 3 hours. Find speed of stream in km/h.

1. 0.5
2. 1
3. 1.5
4. 2

Correct answer

A — 0.5

Explanation (English)

Upstream speed=3 kmph, Downstream speed=4 kmph, Stream speed=(4-3)/2=0.5 kmph

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