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Exercise 1

1)What is 180 kmph as metres per second?
A)15 m /sec
B)20 m /sec
C)45 m /sec
D)50 m /sec

Answer:D)50 m /sec

Explanation: 180 kmph = ( 180 * 5/18) m/sec
= 50 m /sec.

2) What is 55 m/sec as km/hr?
A) 198 km/hr
B) 188 km/hr
C) 178 km/hr
D) 126 km/hr

Answer:A) 198 km/hr

Explanation: 55 m/sec = (55 * 18 / 5 ) km/hr
= 198 km/hr.

3) A train running at the speed of 90 km/hr crosses a pole in 9 seconds. What is the length of the train?
A) 245 metres
B) 225 metres
C) 235 metres
D) 255 metres

Answer:B) 225 metres

Explanation: Speed =(90*5/18)m/sec=25m/sec
As per the formula
length of the train =(Speed x Time).
So length of the train=(25*9)m= 225m.

4) A train having a length of 250 m passes a post in 25 seconds. How long will it take to pass a platform having a length of 650 m?
A) 120 sec
B) 90 s
C) 89 s
D) 80 s

Answer:B) 90 s

Explanation: v = 250/25 (where v is the speed of the train)
= 10 m/s
v is the speed of the train
t = (250+650)/10
= 90 seconds






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