A and B are two railway stations 90 km apart. A train leaves A at 9:00 am, heading towards B at a speed of 40 km/hr. Another train leaves B at 10:30 am, heading towards A at a speed of 20 km/hr. The trains meet each other at
Explanation:
Train A starts at 9 a.m. whereas Train B starts at 10:30 a.m.
Distance travelled by A till 10:30 a.m. = 40 × 1.5 = 60 kms.
At 10:30 a.m. remaining distance between A and B = 90 – 60 = 30 kms.
Time taken for both of them to meet now = 30/(40 + 20) = 0.5 hours i.e., 30 mins.
∴ Both trains meet half after 10:30 a.m. i.e., at 11 a.m.
Hence, option (b).
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