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A man walks on a straight road from his ...

A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km/h. Finding the market closed, he instantly turns and walks back home with a speed of 7.5 km/h. The average speed of the man over the interval of time 0 to 40 min, is equal to

A

5 km/h

B

`25/4` km/h

C

`30/4` km/h

D

`45/8` km/h

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The correct Answer is:
D
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AAKASH SERIES-MOTION IN A STRAIGHT LINE -PRACTICE EXERCISE
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  2. One car moving on a straight road covers one third of the distance wit...

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  3. A man walks on a straight road from his home to a market 2.5 km away w...

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  4. Moving with a uniform acceleration from the state of rest a body cover...

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  5. A car travelling at 108 km h^(-1) has its speed reduced to 36 km h^(-1...

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  6. Speed of two identical cars are u and 4u at a specific instant. The ra...

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  7. A car moving with constant acceleration crosses two points A and B wit...

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  8. A body covers 200 cm in the first 2 sec and 220 cm in the next 4 sec u...

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  9. A car A is traveling on a straight level road with a uniform speed of ...

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  10. Two cars X and Y start off to a race on a straight path with initial v...

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  11. A body weights 500N on the surface of the earth. How much would it wei...

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  12. A particle moving with uniform acceleration has its final velocity (v=...

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  13. A solid sphere of radius 2.45m is rotating with an angular speed of 10...

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  14. When a man stands on a moving escalator he goes up in 50 sec. and when...

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  15. A vehicle moving in a straight road has its speed changed from 5 m/s t...

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  16. A bullet moving at 20 m/sec. strikes a wooden plank and penetrates 4 c...

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  17. A vehicle covers first half of its total distance at a speed 20 kmph. ...

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  18. A vehicle moves for 10 minutes at 20 "ms"^(-1) due north and stops for...

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  19. Two trains A and B of length 400 m each are moving on two parallel tra...

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  20. Two stones are falling at a place from heights in the ratio 2:3. Their...

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