Discussion

Explanation:

A and B move at a relative speed of (320 - 240) = 80 m/min.
A and B come together in 3520/80 = 44 min.

A and C move together at a relative speed of (320 - 210) = 110 m/min.
A and C come together in 3520/110 = 32 min.

A, B and C come together in 352 min (LCM of 44 and 32), i.e.,
A, B and C come together in 5 hrs 52 mins.

Hence, option (b).

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