In 6 seconds, a train 108 metres long travelling at 50 kilometres per hour crosses a train 112 metres long travelling in the other direction. The second train travels at the following speed:
A. 48 km/hr
B. 54 km/hr
C. 66 km/hr
D. 82 km/hr
Answer:D
In 6 seconds, a train 108 metres long travelling at 50 kilometres per hour crosses a train 112 metres long travelling in the other direction. The second train travels at the following speed:
A. 48 km/hr B. 54 km/hr C. 66 km/hr D. 82 km/hr
Explanation: Let the second train's speed be x km/hr ,[ (x + 50) x 5/18 ] m/sec 18 = [ 250 + 5x ]/18 m/sec Relative speed = (x + 50) km/hr = [ (x + 50) x 5/18 ] m/sec = [ 250 + 5x ]/18 m/sec.(108 + 112) = 220 m is the total distance covered.As a result, 220/(250 + 5x)/18 = 6=> 660 = 250 + 5x=> x is equal to 82 km/hr.