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Two trains one of length l(1)=630m and o...

Two trains one of length `l_(1)=630m` and other of length `l_(2)=120m` move uniformly in two parallel paths in opposite direction with speed `mu_(1)=48 km//h`and `mu_(2)=102 km//h` respectively.

A

(a)The relative speed of trains is `54 km//hr`.

B

(b)The relative speed of trains is `50km//hr`

C

(c)Time taken by one train to completely pass another is `15 s`.

D

(d)Time taken by one train to completely pass another is `18 s`.

Text Solution

Verified by Experts

The correct Answer is:
D

`V_(rel)=102+48=150 (km)//hr=150xx(5)/(18)m//s`
and `i_(rel)=v_(rel)xxt`
`rArr750=150xx(5)/(18)t:.t=18 s`
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