Answer:
2.78 hour ≈ 3 hours
d. 3 hours
Explanation:
Speed is defined as the rate of change of distance with time. It is measured in m/s same as velocity. However, speed is a scalar quantity having magnitude but no direction.
Mathematically,
Speed = Distance/time
As such, time = Distance/speed
Total distance covered by Koto = 15000 + 5000 + 20000 +5000
= 45,000 meters
Time = 45000/4.5
= 10,000s
Given that 60 seconds make 1 minute, 10000 seconds in minutes
= 10,000/60
= 166.67 minutes
Given that 60 minutes make 1 hour, then 166.67 minutes in hours
= 166.67/60
= 2.78 hours
≈ 3 hours
