the chennai express of 200 m runs at a speed of 62 km/hr and a person runs on the platform at a speed of 20 km/hr in the direction opposite to that of train. find the time taken by the train to cross the running person?
Answers
Answered by
1
We calculate the relative speed.
The relative speed of approaching bodies is the sum of the two speeds.
In this case it will be:
62 + 20 = 72km/h
We convert this to m/s as follows :
72 × 5/18 = 20m/s
The relative distance is 200m.
Time = Distance /speed
200/20 = 10 seconds
The time is thus 10 seconds
Answered by
2
Answer:8.78 sec
Explanation:
Length of train = 200 m
speed of train = 62 km/hr
speed of person = 20 km/hr
1) Convert km/hr into m/s :-
62 km/hr = 62 x5/18= 17.22 m/s
20 km/hr = 20 x5/18= 5.55 m/s
Relative speed (opposite direction mean Add) :- RS:- 17.22 + 5.55 = 22.77 m/s
Speed =Distance/Time
22.77=200/Time
Time= 200/22.77
Time =8.78 sec
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