two rrains each of length 150 m are moving in opposite direction at 36 km /h and 72 km /h respectively . time taken by then to just cross each other completly each other
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Answer:
10 sec
Explanation:
speed of 1st train =36 km /h
= 36 × 5/ 18
= 10 m /sec
speed of 2nd train = 72 km /h
= 72 ×5 / 18
= 20 m/ sec
two trains each of length= 150m .
time = total distance/ relative speed
= 150 +150 /20+10
=300/30
= 10 sec
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