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.

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.

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.

A) 90 s

B) 89 s

C) 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

Exercise 1