Question

a car completes one round on a circular path in 120 seconds another car completes a round around parallel circular path in 180 seconds both car start together at a same place and run in opposite direction after how many minutes will both the cars be at the place from where they started​

Answer 1

Step-by-step explanation:

Given the first train completes one round of a circular track in 120 seconds and the second train does so in 180 seconds.

Now both trains move in the opposite direction in order to find time after which they will meet for the first time we need to take LCM(120,180)

120=2

3

×3×5

180=2

2

×3

2

×5

∴LCM(120,180)=360seconds=

60

360

=6min

∴ the two trains meet for the first time after 6 mins from where they started.

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