a2zinterviews

16.	Two trains travel in opposite directions at 36 kmph and 45 kmph and a man sitting in slower train passes the faster train in 8 seconds. The length of the faster train is
	A.  80 m
	B.  100 m
	C.  120 m
	D.  180 m

Solution

Relative speed = (36 + 45) km/hr = (81 x 5/18) m/sec = (45 / 2) m/sec Length of the train = (45 / 2 x 8) m = 180 m.

17.	A train 132 m long passes a telegraph pole in 6 seconds. Find the speed of the train
	A.  70 km/hr
	B.  72 km/hr
	C.  79.2 km/hr
	D.  80 km/hr

Solution

Speed = (132 / 6) m/sec = (22 x 18 /5)km/hr = 79.2 km/hr

18.	A train 240 m long passed a pole in 24 seconds. How long will it take to pass a platform 650 m long?
	A.  65 sec
	B.  89 sec
	C.  100 sec
	D.  150 sec

Solution

Speed = (240 / 24) m/sec = 10 m/sec Required time = (240 + 650/10) sec = 89 sec.

19.	A train of length 150 metres takes 40.5 seconds to cross a tunnel of length 300 metres. What is the speed of the train in km/hr ?
	A.  13 33
	B.  26.67
	C.  40
	D.  66.67

Solution

speed =(150 + 300 / 40.5)m/sec =(450/40.5x18/ 5) km/hr = 40 km/hr

20.	In what time will a train 100 metres lomg cross an electric pole, if its speed be 144 km/hr?
	A.  2.5 seconds
	B.  4.25 seconds
	C.  5 seconds
	D.  12.5 seconds

Solution

Speed = (144 x 5 / 18)m/sec Time taken = (100 /40 ) sec = 2.5 sec