A man travels some distance at a speed of 20 km/hr and returns at a speed of 15 km/hr. If the total time taken by him is 2 hrs 20 min, the distance is

Let the distance travelled by a man be D km According to the question, Total time taken = 2 hrs 20 min = 2(20/60) = 7/3 hours Total time = T_{1} + T_{2} D/20 + D/15 = 7/3 (3D + 4D)/60 = 7/3 7D/60 = 7/3 D = 20 km

- Two person A and B started from same place and in same direction with speed of 48km/hr and 40km/hr respectively .The speed of person B increased by ½ km every hr. after what time A and B will meet .
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- A person has to travel a distance of 30 km. He finds that he has covered 5/6 of the distance in 3 hours and 20 minutes. what is his speed in km/h?
- Average speed of ‘A’ during a 20-hour journey is 32 km/h. If he covered the first 240 km of his journey at a speed of 20 km/h, then find the speed at which ‘A’ travelled during the remaining journey.
- If a man cycles at 10 km/hr, then he arrives at a certain place at 1 p.m .If he cycles at 15 km/hr, he will arrive at the same place at 11 am At what speed must he cycle to get there at noon?
- Buses A and B are moving around a circular ground of radius 210 m. If the speeds of the buses A and B are 10 m/sec and 15 m/sec respectively, then what is the difference between the time taken by bus A and B to complete 2 round of the ground?
- A train has to cover a distance of 120 km in 10 hours. If it covers half journey in 3/5
^{th}time, then the speed of covering the remaining distance in the time left has to be: - Rohan and Tanuj move towards Dehradun starting from Delhi at a speed of 30 km/h and 50 km/h respectively. If Tanuj reaches Dehradun 300 minutes earlier than Rohan, what is the distance between Delhi and Dehradun?
- A policeman saw a thief from a distance of 450 m. When the policeman started chasing him, the thief also started running. The ratio of speeds of the thief to the policeman is 7 : 8. After running how much distance (in km) can the policeman catch the thief?
- Sheetal rides a bike at an average speed of 40 kmph and reaches her destination in 5 hours. Hemlata covers the same distance in 4 hrs. If Sheetal increases her average speed by 10 kmph and Hemlata increases her average speed by 10 kmph, what would be the difference in their time taken to reach destination?

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