Question

36.
A passenger sitting in a during train can
count 21 telephone poles in 1 minute. If
the telephone poles are placed at 50 m
apart, what is the speed of the train ?
(1) 57 km/hr (2) 60 km/hr
(3) 63 kn/hr (4) 55 km/h
(5) None of above​

Answer 1

$\huge \fbox \purple{Answer:-}$

2) 60 km/hr

$\huge \fbox \purple{Solution:-}$

Distance between the 21 telephone posts =20×50m=1000m

Time taken to cross these posts = 1 minute (60 seconds)

∴ Speed of the train,

= 1000/60 m/s

= 1000/60 × 18/5

= 60 km/hr