Question

two trains of length of 120 metre and 80 meters are running in the same direction with velocity of 40 kilometre per hour and 50 kilometre per hour respectively the time taken by them to cross Each Other is what​

Answer 1

Answer:

10 seconds

Explanation:

let the length of 1st train L1= 120m

length of 2nd train L2= 80m

speed of 1st train S1=42 km/hr

speed of 2nd train S2 = 30 km/hr

now formula is

speed= distance/ time

so,

S1 + S2 = (L1 + L2)/ time

(42 + 30) km/hr = (120+80) m/ time

72 km/hr = 200 m/ time

now convert the speed from km/hr to m/s by multiplying 5/18

72*5/18 = 200/ time

20 m/s = 200 m/ time

time= 200/ 20

time = 10 seconds

so the train will cross each other in 10 seconds.

hope it helps you...