30) Two trains are moving in the opposite directionand their speeds ar

1.	30) Two trains are moving in the opposite directionand their speeds are in the ratio 4:13. The first trainpasses a standing man in 13.25 seconds and anotherin 9 seconds. The time taken by trains to cross eachother isC,
Answer» Answer:10 second Step-by-step explanation: Let speed of first train be 4x and that of second be 13x. first train passes a standing man in 13.25 second so Length of first train = 13.25 * 4x =53x second train passes a standing man in 9 second so Length of second train=9 * 13x = 117x Time taken by trains to pass each other = total length/total speed=170x/17x=10 the time taken by trains to cross each other is 10 second

30) Two trains are moving in the opposite directionand their speeds are in the ratio 4:13. The first trainpasses a standing man in 13.25 seconds and anotherin 9 seconds. The time taken by trains to cross eachother isC,

Answer»

Answer:10 second

Step-by-step explanation:

Let speed of first train be 4x and that of second be 13x.

first train passes a standing man in 13.25 second so

Length of first train = 13.25 * 4x

=53x

second train passes a standing man in 9 second so

Length of second train=9 * 13x

= 117x

Time taken by trains to pass each other = total length/total speed=170x/17x=10

the time taken by trains to cross each other is 10 second