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प्रश्न
Boojho walks to his school which is at a distance of 3 km from his home in 30 minutes. On reaching he finds that the school is closed and comes back by a bicycle with his friend and reaches home in 20 minutes. His average speed in km/h is ______.
पर्याय
8.3
7.2
5
3.6
MCQ
रिकाम्या जागा भरा
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उत्तर
Boojho walks to his school which is at a distance of 3 km from his home in 30 minutes. On reaching he finds that the school is closed and comes back by a bicycle with his friend and reaches home in 20 minutes. His average speed in km/h is 7.2.
Explanation:
Average speed = `"Total distance"/"Time taken"`
= `((3 + 3)"km")/((1/2 + 1/3)"h"`
= `6/(5/6)`
= `36/5`
= 7.2 km/h
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संबंधित प्रश्न
Average speed of a moving object is equal to the magnitude of its average velocity when it travels.
Match the following:
| a. | Uniform motion. | i. | Body having uniform acceleration |
| b. | Non-uniform motion. | ii. | Body at rest. |
| c. | The velocity-time graph is a circle. | iii. | Unequal distance covered in equal interval of time. |
| d. | Straight-line parallel to time axis in the position-time graph. | iv. | Equal distances covered in equal intervals of time. |
| e. | Straight-line inclined to 45° with a time axis is a velocity-time graph. | v. | Not possible. |
