Train A with speed 36 km hr crosses Train B in opposite direction in 20 secs Sum of the length of Tr...........

Quantitative Aptitude(IBPS CL) Problems on trains

Train A with speed 36 km/hr crosses Train B in opposite direction in 20 secs. Sum of the length of Train A & B is 600 m. What is the speed of Train B?

60 km/hr

72 km/hr

84 km/hr

56 km/hr

None of the above/More than one of the above

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Explanation:

Speed of train A = 36 ×5/18 = 10 m/sec
Let the speed of train B be x m/sec.
According to question,
600/(10+x) = 20
⇒ 200 + 20x = 600
⇒ 20x = 400 ⇒ x = 20
Speed of train B = 20 × 18/5= 72 km/h