KVPY SA Exam 2013 Question Paper

Question : 11 of 80

Marks: +1, -0

A person X is running around a circular track completing one round every 40 seconds. Another person Y running in the opposite direction meets X every 15 seconds. The time, expressed in seconds, taken by Y to complete one round is

12.5
24
25
55

Validate

Solution:

θ={2π}/40×15

=2π-{2π}/n×15

∴3/8=1-15/n

⇒ n = 24

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