Question

a train 320 m long is traveling at a uniform speed of 66km/hr. if it passes a platform in 42 seconds find the length of the platform​

Answer 1

Answer:

450 m

Step-by-step explanation:

length of the train (a)=320m

length of the platform=b

speed=66km/h=55/3 m/s

time=42s

320+b/42=55/3

320+b=770

b=770-320=450

so the length of the platform=450m

please rate

Answer 2

Answer

450m

Step-by-step explanation:

let the platfrom length = x

then, convert 66km/hr into m/s

so, x+320m/42sec  =  55/3m/s

cross multiplication of above equation

=> 42×55  =  x+320×3

=> 2310  =  x+320×3

=> 2310/3  =  x+320

=> x  =  770-320

=> x  = 450

so, the length of platfrom is 450meters