Latest TCS Aptitude Question SOLUTION: 75. One train travels 200m from A to B with 70 km/hr and returns to A with 80 kmph, what is the average of their speed?

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75. One train travels 200m from A to B with 70 km/hr and returns to A with 80 kmph, what is the average of their speed?

Asked In TCS M.JOSHNA (11 years ago)

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IFFAT IRAM  (11 years ago)

distance between A and B = 200m=0.2km
speed from A to B = 70km/hr
time taken to go from A to B = 0.2/70 = 1/350 hr
speed from B to A= 80km/hr
time taken to return from B to A = 0.2/80 = 1/400 hr
total time taken = 1/350+1/400 = 3/560 hr
total distance covered = 0.4km
avg speed = 0.4/3/560=74.67km/hr

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varsha  (9 years ago)

Average speed= 2xy/x+y
74.67 km/hr

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