If John covers a certain distance in 1 hr. 24 min. by covering two third of the distance at 4 kmph and the rest at 5 kmph, then find the total distance.
Answer: B
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Two trains 121 meters and 165 meters in length respectively are running in opposite directions, one at the rate of 80 km and the other at the rate of 65 kmph. In what time will they be completely clear of each other from the moment they meet?
Answer: D
T = (121 + 165)/ (80 + 65) * 18/5
T = 7.15
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In covering a distance of 30 km, Abhay takes 2 hours more than Sameer. If Abhay doubles his speed, then he would take 1 hour less than Sameer. Abhay's speed is:
Answer: A
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If a train, travelling at a speed of 90 kmph, crosses a pole in 5 sec, then the length of train is?
Answer: B
D = 90 * 5/18 * 5 = 125 m
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How much time will a train of length 200 m moving at a speed of 72 kmph take to cross another train of length 300 m, moving at 36 kmph in the same direction?
Answer: A
The distance to be covered = Sum of their lengths = 200 + 300 = 500 m.
Relative speed = 72 -36 = 36 kmph = 36 * 5/18 = 10 mps.
Time required = d/s = 500/10 = 50 sec.
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A man walks at a speed of 3 km/hr and runs at a speed of 7 km/hr. How much time will the man require to cover a distance of 10 1/2 km, if he completes half of the distance, i.e., (5 1/4) km on foot and the other half by running?
Answer: D
Required time = (5 1/4)/3 + (5 1/4)/7 = 2 1/2 hours.
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How much time does a train 125 metres long running at 60 km/hr take to pass a pole?
Answer: C
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Rohit covers one-fourth of the total distance at 20 km/hr, one-fourth at 10 km/h and rest of his journey at 80 km/h. Find Rohit’s average speed for the whole distance?
Answer: A
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If a man can cover 12 metres in one second, how many kilometres can he cover in 3 hours 45 minutes?
Answer: B
12 m/s = 12 * 18/5 kmph
3 hours 45 minutes = 3 3/4 hours = 15/4 hours
Distance = speed * time = 12 * 18/5 * 15/4 km = 162 km.
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A train 100 m long crosses a platform 125 m long in 15 sec; find the speed of the train?
Answer: C
D = 100 + 125 = 225
T = 15
S = 225/15 * 18/5 = 54 kmph
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