Problems on Trains - Data Intensity 1 Questions and Answers Discussion Page.

18.	A train moves past a telegraph post and a bridge 264 m long in 8 seconds and 20 seconds respectively. What is the speed of the train?
	A.	69.5 km/hr
	B.	70 km/hr
	C.	79 km/hr
	D.	79.2 km/hr

Answer: Option D

Explanation:

Let the length of the train be x metres and its speed by y m/sec.

Then,	x	= 8 x = 8y
	y

Now,	x + 264	= y
	20

8y + 264 = 20y

y = 22.

Speed = 22 m/sec =		22 x	18		km/hr = 79.2 km/hr.
			5

Tutorial Link:

Published by:Michael Daani

PakMCQs.net

Computer Science Civil Engineering

Networking Electronics Database

Model Papers FPSC Papers