Question: Two friends start walking from the same point in the same direction. One walks at 4 km/h and the other at 6 km/h. How long will it take for the faster friend to be 3 km ahead?
A) 1 hour
B) 1.5 hours
C) 2 hours
D) 2.5 hours
Solution:
The relative speed between the two friends is:
Relative speed=6 km/h−4 km/h=2 km/h
Time taken for the faster friend to be 3 km ahead:
Time= Distance/Relative speed = 3⁄2 =1.5 hours
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