CBSE Class 7 Answered
(i) Why do we need to measure time?(ii) A dog runs behind you for 30 minutes and the distance covered by the dog is 3 km. What should be your minimum speed if dog was not able to bite you?
Asked by Topperlearning User | 05 Jun, 2014, 10:20: AM
Expert Answer
(i) We need to measure time in order to keep track of our day to day activities. For eg. Meeting with the doctor, Attending our class at time etc.
(ii) Your speed should be greater than that of the dog. Thus we will find speed of the dog and will come to know the minimum of your speed.
Speed = Distance covered / Time taken
= 3 / 30 = 1/10 km/min.
Therefore, Speed = (1/10) x (1000/3600) = 1/36 m/s.
Thus you must run at least above the speed of (1/36) m/s.
Answered by | 05 Jun, 2014, 12:20: PM
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