Question
Two trains of lengths 100 m and 90 m are running with
speeds of 60 km/hr and 57 km/hr respectively towards each other on parallel lines. If they are 70 m apart, after how many seconds they will cross each other?Solution
Relative speed = (60 + 57) km/hr. = 117 km/hr. => 117 × (5/18) m/sec = 65/2 m/sec Distance covered = 100 + 90 + 70 = 260 m Required time = 260 × (2/65) = 8 sec
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