Answer:

155 m

Step-by-step explanation:

train,

speed = 90km/hr =25m/s

length of platform = 220m

time = 15seconds

length of train = L (assumption)

we know,

s = d/t

s = length of train + platform/ time

25 = L + 220/15

15*25 = L + 220

375 = L + 220

L = 375 - 220

L = 155m

hence , the length of train = 155m