Question

A train crosses a bridge 100 m long in 45 seconds at a speed of 60 km/h
Find the time taken by the train to cross a clock tower.​

Answer 1

Answer:

solution:−

Given

=> Length of bridge = 100 m

=>Crosses in bridge in time = 45 sec

=> Speed of train is 60km/h

=> let the length of train = x

:-. Total distance = length ot train + length of bridge = 100 + x

convert km/ h. into m/ sec

60×5/18 ms-1 = 50/3 ms -1

: Formula

=> speed = distance Time

=> 50/3 = 100+x/ 45

=> 50= 100+x

=> 50 × 15 =100+ x

=> 750 = 100+ x

=> x= 650

so, length of train => 650 we have a to find time taken, so given

speed => 50/3 m/3

distance => 650 m

: Formula

speed = distance/ time

put the value , we get

50/3 = 650/ x

1/3 = 13/x

=> 39

so time => 39 sec time taken

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