Question

4 points

Two trains 130 metres and 80 metres long are running in opposite direction, are at the rate of 75 km/hr and another are at the rate of 33 km/hr. From the moment they meet, they will cross each other in

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Answer 1

Answer:

7 second

Step-by-step explanation:

Here v1-=75 km/hr

v2=-33 km/h

effective velocity=v1-v2=75-(-33))

=75+33=108 km/hr

as shown in the fig to cross both thetrains completely

the distance to be covere

=AB+C'D'

=130+80=210 m

Time=distance/speed

=210 m/108

=0.210/108   hr

0.21*3600/108

=756/108

t= 7 second

Answer 2

Answer:

1. distance=130+80=210m
2. speed=75+33=108km/h
3. convert km/h into mls
4. 108multiply1000/3600
5. m/s=30m/s
6. T=D/S
7. 210/30=7sec