a2zinterviews

6.	An aeroplane covers a certain distance at a speed of 240 kmph in 5 hours. To cover the same distance in 1x2/3 hours, it must travel at a speed of
	A.  300 kmph
	B.  360 kmph
	C.  600 kmph
	D.  720 kmph

Solution

Distance = 1200 km. Required speed = (1200 x 3/5)km/hr = 720 km/hr.

7.	A truck covers a distance of 550 metres in 1 minute whereas a bus covers a distance of 33 kms in 45 minutes. The ratio of their speed is
	A.  3 : 4
	B.  4 : 3
	C.  3 : 5
	D.  5 : 3

Solution

Ratio of speeds =(550/60 x 18/5) : (33/45 x 60) =33 : 44 = 3 : 4

8.	A boy goes to his school from his house at a speed of 3 km.hr and returna at a speed of 2 km/hr. If he takes 5 hours in going and coming, the distance between his house and school is
	A.  5 km
	B.  5.5 km
	C.  6 km
	D.  6.5 km

Solution

Average speed = (2 x 3 x 2/3+2)km/hr = 12/5 km/hr. Distance travelled = (12/5 x 5)km =12 km Distance between house and school = (12 / 2)km =6 km

9.	A man on tour travels first 160 km at 64 km/hr and the next 160 km at 80 km/hr. The average speed for the first 320 km of the tour is
	A.  35.55 km/hr
	B.  36 km/hr
	C.  71.11 km/hr
	D.  71 km/hr

Solution

Total time taken = (160/64 + 160/8)hrs = 9/2 hrs. Average speed = (320 x 2/9) km.hr = 71.11 km/hr.

10.	An athlete runs 200 metres race in 24 seconds. His speed is
	A.  20 km/hr
	B.  24 km/hr
	C.  28.5 km/hr
	D.  30 km/hr

Solution

Speed = 200/24 m/sec = 25/3 m/sec = (25/3 x 18/5) km/hr = 30 km/hr.