1. Car A runs
at the speed of 65 km/h and reaches its destination in 8h. Car B runs at the
speed of 70 km/h and reaches its destination in 4h. What is the respective ratio
of distances covered by Car A and Car B?
(a) 11 : 7
(b) 7 : 13
(c) 13 : 7
(d) 7 : 11
(e) None of these
2. A bus
started its journey from Nandyal and reached Kadapa in 44 min with its average
speed of 50 km/hr. If the average speed of the bus is increased by 5 km/hr, how
much time will it take to cover the same distance?
(a) 40 min
(b) 38 min
(c) 36 min
(d) 31 min
(e) 49 min
3. The wheel
of an engine 4 (2/7) metres in circumference makes seven revolutions in 4
seconds. Find the speed of the train in km per hour.
(a) 27
(b) 30
(c) 33
(d) 36
(e) None of these
1. Ans.(c)
ReplyDeleteSol. Distance travelled by Car A = 65 × 8 = 520 km
Distance travelled by Car B = 70 × 4 = 280 km
Ratio = 520/280 = 13 : 7
2. Ans.(a)
ReplyDeleteSol. Distance between Nandyal and Kadapa =(50*44)/60=110/3
Average speed of the bus is increased by 5 kmph then the
speed of the bus = 55 kmph
Required time = 110/3*60/55 = 40 min
3. Ans(a)
ReplyDeleteSol. Distance covered in 4 seconds =30/7*7 metres
Speed in m/s = 30/4
Speed in kmph = 30/4*18/5= 27 kmph