1.

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

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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