11) A motor car does a journey in 9 h, the first half at 12 km/h and second half at 15 km/h. Find the distance.
a) 120 km
b) 100 km
c) 124 km
d) 96 km
12) Two men A and B start from a place P walking 4 km and 5km/h respectively. How many km will they be apart at the end of 4 h, if they walk in same direction ?
a) 3 km
b) 4 km
c) 2 km
d) 4.5 km
13) Without stoppage a person travels a certain distance at an average speed of 15km/h and with stoppages he covers the same distance a an average speed of 12 km/h. How min per hour does he stop ?
a) 15 min
b) 12 min
c) 16 min
d) 18 min
14) On a tour a man travels at the rate of 64 km/h for the first 160 km, then travels the next 160 km at the rate of 80 km/h. The average speed in km per hour for the first 320 km of the train is
a) 35.55 km/h
b) 71.11 km/h
c) 36 km/h
d) 72 km/h
15) pravat covers a distance in 40 min if he drives at a speed of 60 km/h on an average. Find the speed at which he must drive at to reduce the time of the journey by 25 %.
a) 60 km/h
b) 70 km/h
c) 75 km/h
d) 80 km/h
16) A man covers a certain distance between his house and office on scooter, having an average speed of 60 km/h he is late by 20 min. However, with a speed of 80 km/h he reaches his office 10 min earlier. Find the distance between his house and office
a) 120 km
b) 90 km
c) 80 km
d) 60 km
17) Two men A and B walk from P to Q, a distance of 22 km, at 5 and 6 km an hour respectively. B reaches Q, returns immediately and meets A at R. Find the distance P to R.
a) 16 km
b) 18 km
c) 20 km
d) 15 km
18) Two bullets were fired at a place at an interval of 38 min. A person approaching the firing point in his car hears the two sounds at an interval of 36 min. The speed of sound is 330 m/s. What is the speed of the car ?
a) 66 km
b) 49 km
c) 99 km
d) 98 km
19) A train leave the station 1 h before the scheduled time. The driver decreases its speed by 50 km/h. At the next station 300 km away, the train reached on time. Find the original time of the train.
a) 100 km/h
b) 150 km/h
c) 125 km/h
d) 200 km/h
20) Two trains, Kolkata Mail and Bombay Mail, start at the same time from stations Kolkata and Mumbai respectively towards each other. After passing each other, they take 12 hours and 3 hours to reach and Kolkata respectively. If the Kolkata Mail is moving at the speed of 48 km/h, the speed of the Bombay Mail is
(a) 24 km/h
(b) 22 km/h
(c) 21 km/h
(d) 96 km/h