Question

• length of train is 315 m and speed is 72 km/hr, time is 23 sec, what is platform length?

Answer 1

let platform length =x
speed=distance/time
72=315+x/23
72×5/18 =315+x/23
4×5=315+x/23
20=315+x/23
20×23=315+x
460=315+x
x=460-315
x=145meters is answer