Find the speed of train with length 0 9 km ........

Quantitative Aptitude ( CCS) Problems on trains

Study the following information and answer the questions that follow:
Two trains of length 1.1 km and 0.9 km are moving in the opposite direction at a speed of ‘X kmph’ and ‘1.5X kmph’ respectively. The time taken by the slower train to completely cross the faster train is 48 seconds.

Find the speed of train with length 0.9 km

60 kmph

90 kmph

120 kmph

150 kmph

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Explanation:

relative speed= X +1.5 X = 2.5 Xkmph =5*2.5X/18 m/s
distance to be covered=1.1+0.9 =2 km= 2000m
time = 48 sec
48 = 2000/ (2.5X*5/18)
X=60
So Speed of train A=60 kmph
Speed of B =90 kmph