A car covers a distance of 100 km in the first two hours, 120 km in next 1 hour and 32 cm in next 12 hour. Convert the speed into m sec.
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Total distance covered by the car = (100 + 120 + 32) km = 252km
Total time taken = (2 + 1 + 1/2) hr = (4 + 2 + 1)/2 = 7/2 hr
Therefore, average speed = Distance covered/Time taken
= 252 km/(7/2) hr
= 252/1 × 2/7 km/hr
= 72 km/hr
To convert the speed into m/sec, we multiply by 5/18
Therefore, 72 km/hr = 72 × 5/18 = 20 m/sec
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