‘A’ and ‘B’ are two stations 494 km apart. A train starts from station ‘A’ at 3 p.m. and travels towards station ‘B’ at 83 km/h. Another train starts from station ‘B’ at 4 p.m. and travels towards station ‘A’ at 54 km/h. At what time do they meet?
Explanation:
Distance travelled by A till 4 pm = 83 × 1 = 83 kms.
Distance between A and B at 4 pm = 494 - 83 = 411 kms
Relative speed of A and B after 4 pm = 83 + 54 = 137 km/hr
∴ Time taken for A and B to meet = Relative Distance between themTheir relative speed = 411137 = 3 hours.
∴ They meet 3 hours after 4 pm i.e., at 7 pm.
Hence, option (a).
» Your doubt will be displayed only after approval.