A racing car going at an average speed of 108 km/hr takes 15 minutes to complete

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Question
A racing car going at an average speed of 108 km/hr takes 15 minutes to complete a lap on a racing track. By how much should it increase its speed (inkm/hr) to complete the lap in 12 minutes?
Options
A. 24
B. 21
C. 27
D. 30

Correct Answer

27

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Time and Distance problems

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1. 3 hrs after a goods train passed a station, another train travelling at a speed of 88 km/hr following that goods train passed through that station. If after passing the station the train overtakes the goods train in 8 hours. What is the speed of the goods train?
Options
A. 76.8 km/hr
B. 64 km/hr
C. 96 km/hr
D. 51.2 km/hr

2. Two cars travel from city A to city B at a speed of 30 and 45 km/hr respectively. If one car takes 2.5 hours lesser time than the other car for the journey, then the distance between City A and City B is:
Options
A. 270 km
B. 338 km
C. 180 km
D. 225 km

3. Suresh goes on a trip on his motor-cycle and rides for 410 kms. If he rides for 5 hours at a speed of 50 km/hr, find at what speed he travels for the remaining 4 hours of the journey?
Options
A. 47 km/hr
B. 40 km/hr
C. 56 km/hr
D. 48 km/hr

4. Two cars travel from city A to city B at a speed of 60 and 108 km/hr respectively. If one car takes 2 hours lesser time than the other car for the journey, then the distance between City A and City B?
Options
A. 270 km
B. 324 km
C. 405 km
D. 216 km

5. A thief is stopped by a policeman from a distance of 400 metres. When the policeman starts the chase, the thief also starts running. Assuming the speed of the thief as 5 km/h and that of policeman as 9 km/h, how far the thief would have run, before he is over -taken by the policeman?
Options
A. 400 metres
B. 600 metres
C. 500 metres
D. 300 metres

6. Two cars A and B travel from one city to another, at speeds of 72 km/hr and 90 km/hr respectively. If car B takes 1 hour lesser than car A for the journey, then what is the distance (in km) between the two cities?
Options
A. 270
B. 360
C. 240
D. 400

7. B starts 4 minutes after A from the same point, for a place at a distance of 7 miles from the starting point. A on reaching the destination turns back and walks a mile where he meets B. If A's speed is a mile in 8 minutes then B's speed is a mile in ____ minutes.
Options
A. 9
B. 12
C. 10
D. 8

8. A can do a piece of work in 10 days, B in 15 days. They work together for 5 days, the rest of the work is finished by C in two more days. If they get Rs. 3000 as wages for the whole work, what are the daily wages of A, B and C respectively (in Rs):
Options
A. 200, 250, 300
B. 300, 200, 250
C. 200, 300, 400
D. None of these

9. A, B and C can do a piece of work in 24 days, 30 days and 40 days respectively. They began the work together but C left 4 days before the completion of the work. In how many days was the work completed?
Options
A. 11 days
B. 12 days
C. 13 days
D. 14 days

10. 12 men can complete a work in 8 days. 16 women can complete the same work in 12 days. 8 men and 8 women started working and worked for 6 days. How many more men are to be added to complete the remaining work in 1 day?
Options
A. 8
B. 12
C. 16
D. 24

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