1) The average
speed of a car is 1 (4/5) times the average speed of a bus. A tractor covers
575 km in 23 hours. How much distance will the car cover in 4 hours if the
speed of the bus is twice speed of the tractor?
(a) 340 km
(b) 480 km
(c) 360 km
(d) 450 km
(e) None of these
2) A bike covers
a certain distance at the speed of 64 km/h in 8 hours. If the bike was to cover
the same distance in approximately 6 hours, at what approximate speed should
the bike travel?
(a) 80 km/h
(b) 85 km/h
(c) 90 km/h
(d) 75 km/h
(e) 70 km/h
3) The ratio
between the speed of a train and a car is 16 : 15 respectively. Also, a bus
covered a distance of 480 km in 8 h. The speed of the bus is three-fourth the
speed of the train. How much distance will the car cover in 6 h?
(a) 450 km
(b) 480 km
(c) 360 km
(d) Cannot be determined
(e) None of these
1. Ans.(c)
ReplyDeleteSol. Average speed of a tractor = 25 km / h
The speed of a bus in an hour = 25 × 2 = 50 km
The speed of a car in an hour = 9/5 * 50 = 90 km
So, the distance covered by car in 4 h is
90 × 4 = 360 km
2. Ans.(b)
ReplyDeleteSol. Total distance = 64 × 8 = 512 km
Now speed = 512/6 = 85.34 km/ h
3. Ans.(a)
ReplyDeleteSol. Speed of bus = 480/8 = 60 kmph
Speed of train = (60*4)/3=80 kmph
Speed of train : Speed of car = 16 : 15
Speed of car =80/16 * 15 = 75 kmph
Distance covered by car in 6 hr = 75 × 6 = 450 km