Relative Velocity

Important

If two objects A and B are moving with speeds $$S_a$$ and $$S_b$$km/h then the relative velocity between them

A.) When they are moving in same direction is $$(S_a-S_b)$$ km/hr

B.) When they are moving in opposite direction $$(S_a+S_b)$$ km/hr

Question 1

Ajay and Vijay race 2400 metres around a 400m circular track. Ajay is 50% faster than Vijay and gains a lap over him in 4 minutes. Find the time taken by Ajay to finish the race?

Question 2

X left for work from his house at 8:00 AM at a speed of 30 kmph. His brother started from the same place at 8:15 AM at a speed of 35 kmph. At what time and how far from their house do they meet?

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