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28 Apr 2021, 04:45
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B
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Difficulty:
15%
(low)
Question Stats:
83% (01:16) correct
17%
(01:17)
wrong
based on 149
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History
Date
Time
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A train 150 m long is running at the rate of 30 m/sec. What time will it take to cross a man walking in the opposite direction at the speed of 5 m/sec?
(A) 3 sec
(B) 4 2/7 sec
(C) 5 sec
(D) 6 sec
(E) 7 sec
(A) 3 sec
(B) 4 2/7 sec
(C) 5 sec
(D) 6 sec
(E) 7 sec
28 Apr 2021, 04:52
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//train// ------------------------> 30m/s
5m/s <------------------------- //person//
the relative speed of the train would then be = speed of train + speed of man (opp direction)
Rel_speed = 35m/s
distance = 150 m
time taken = distance / rel_speed
= 150/35 = 30/7 m/s
hence B
5m/s <------------------------- //person//
the relative speed of the train would then be = speed of train + speed of man (opp direction)
Rel_speed = 35m/s
distance = 150 m
time taken = distance / rel_speed
= 150/35 = 30/7 m/s
hence B
28 Apr 2021, 05:01
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Given: A train 150 m long is running at the rate of 30 m/sec.
Asked: What time will it take to cross a man walking in the opposite direction at the speed of 5 m/sec?
Distance to be travelled = 150 m
Relative speed = 35 m/s
TIme required = 150 / 35 = 30/7 = 4 2/7 sec
IMO B
Asked: What time will it take to cross a man walking in the opposite direction at the speed of 5 m/sec?
Distance to be travelled = 150 m
Relative speed = 35 m/s
TIme required = 150 / 35 = 30/7 = 4 2/7 sec
IMO B
