Question

Convert 1B)5 m/s into km/hr

A) 72 km/hr B) 42 km/hr C) 45 km/hr D) 30 km/hr​

Answer 1

Answer:

otal 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

Explanation: