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How many seconds does Dinesh take to cover a distance of 400 m, if he runs at a speed of 20 km/hr.1. 72 sec2. 70 sec3. 60 sec4. 12 sec |
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Answer» Correct Answer - Option 1 : 72 sec GIVEN: Dinesh speed = 20 km/hr = 20 × 5/18 = 50/9 m/s and Distance = 400 m FORMULA USED: Distance = Speed × Time CALCULATION: Distance = Speed × Time ⇒ 400 = 50/9 × Time ⇒ Time = 72 sec ∴ Time required to cover a distance of 400 m with speed of 50/9 m/s = 72 seconds |
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