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Two trains 165 m and 135 m long run at the speed of 70 km/hr and 38 km/hr respectively in opposite directions on parallel tracks. The time (in seconds) which they take to cross each other is:
- A4 sec
- B5 sec
- C10 sec
- D13 sec
Correct answer: C
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0
CCommunity
10 sec
NA
NA
0
CCommunity
Solution:
Since the two trains are said to be running opposite to each other in parallel track , we have,
Relative speed of the faster train w.r.t slower train
= Sum of the speed of two trains
= 70 + 38 = 108 × (5/18)
S = 30 m/sec
In that case, the distance travelled = Sum of the length of the trains
D = 165 + 135 = 300 m
So, the time required = D / S
= 300 / 30
= 10 sec
So, the correct option is C). 10 sec
Since the two trains are said to be running opposite to each other in parallel track , we have,
Relative speed of the faster train w.r.t slower train
= Sum of the speed of two trains
= 70 + 38 = 108 × (5/18)
S = 30 m/sec
In that case, the distance travelled = Sum of the length of the trains
D = 165 + 135 = 300 m
So, the time required = D / S
= 300 / 30
= 10 sec
So, the correct option is C). 10 sec