Vinay's watch is fast by 90 minutes in 30 days. Kumkum's watch lags behind by 15 sec. per 3 hours. If Their watches indicated the same time at 10 o'clock in the morning, then by how many minutes would Vinay's watch be ahead of Kumkum’s watch that next night at 10 o'clock?
1
16/3 min
2
15/2 min.
3
15/4 min
4
16/5 min.