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Two persons start moving from two point A and B in opposite directions towards each other. One person start moving from A at the speed of 6 km/h and meets the other person coming from B after 4 hours. If the distance between A and B is 42 km, find the speed of the other person in kmph.


1. 3.5
2. 4
3. 4.5
4. 5

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Correct Answer - Option 3 : 4.5

Given:

d(A) = 6 km

t(B) = 6 hr

D = 42 km

Formula used:

S = d/t

Calculation:

Let speed of the second man be x kmph

⇒ Distance covered by first person in 4 hours = 6 × 4

⇒ Distance covered by first person = 24 km

⇒ Distance travelled by second person in 4 hours = 4x km

⇒ Total distance travelled by both of them together in 4 hours = 42 km

⇒ 24 + 4x = 42

⇒ 4x = 18

⇒ x = 4.5 km/h

∴ the speed of the other person is 4.5 km/h.

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