Part ACSIR NET June 2025half-way-round-is-diametrically-opposite-so-the-chord-home-is-2r

Half way round is diametrically opposite so the chord home is 2r

Rahul and his father started jogging on a circular track of radius 'r' (r > 2). Rahul completed one round and stopped. His father got tired half way into the first round and returned to his starting point along a straight line. What is the ratio of the distances covered by Rahul and his father?

A. $π r / (π + 2)$
B. $2 π / (π + 2)$ ✓
C.1
D.2

You have the answer. Trap Analysis is why the other three were written.

Not a worked solution repeated four times — the specific reasoning error each wrong option was built to reward, and why this one tests execution slip.

See pricing

50 are analysed free — try those first.

The trap it tests

Execution slip

The idea was right. The computation was not.

Drill statements like this

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