Discussion

Explanation:

Shruti and Krishna leave for the first time. Their first meeting is after one hour, the second is after an additional half an hour.
So, the interval between subsequent meetings keeps halving every time.

∴ Total time = 60 + 30 + 15 + ….
 
This is an infinite G.P. with a = 60 and r = 1/2

∴ Sum of terms = a / (1 – r) = 60 /[1 – (1/2)] = 120 minutes = 2 hours

Hence, option (a).

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