15.A train takes 18 seconds to pass completely through a station 162 m long and 15 seconds through another station 120 m long. The length of the train is
A. 70 m B. 80 m
C. 90 m D. 100 m
Answer:C
Let the length of the train be x metres.
= x + 162 / 18
= x + 120 / 15
= 15( x+162)
= 18(x+120)
x= 90.
