Question

A motorist travels 406km during a 7.0 hr period. what was the average speed in km/hr and m/s

Answer 1

Speed = Distance/time

Distance = 406 km

Time = 7 hours

Speed = 406/7 = 58 km/h

Speed in m/s = 58 * 5/18 = 16.11 mps

Answer 2

Find the average speed in km/h:

7 hours = 406 km

1 hour = 406 ÷ 7 = 58 km

Therefore the speed is 58 km/h

Find the average speed in m/s:

7 hours = 406 km

7 hours = 406,000 m

Find 1 hour:

1 hour = 406,000 ÷ 7 = 58,000 m

Find 1 min:

1 min = 58,000 ÷ 60 = 2900/3 m

Find 1 sec:

1 second = 2900/3 ÷ 60 = 145/9 = 16.11 m

Therefore the speed is 16.11m/s

Answer: (a) 58 km/h (b) 16.11m/s