Question

26. A train running at a uniform speed crosses a 122
m long platform in 17 s and a 210 m long bridge
in 25 s. The speed of the train is
(a) 46.5 km/h
(b) 37.5 km/h
(c) 37.6 km/h
(d) 39.6 km/h

Answer 1

Step-by-step explanation:

a train has to cross the bridge + the its length too

so let's take length of train as X and speed be y

s = d/t

y = (122+X)/17

17y = 122 + x

x + 17y = 122 ----- eq1

second case

s=d/t

y = (210+X)/25

25y = 210 +X

x + 25y = 210 ---- eq2

subtractung 1 from 2

8y = 88

= 11m/s

and 65m is length on train

so we got ans in m/s let's convert it to km/hr

11 * 18/5

= 39.6 km/HR

D