<u>Answer of question (1):</u>
The given speed = 12250 m/hr (meters per hour)
It is required to find speed in m/s (meter per second)
∵ one hour = 60 minutes = 3600 seconds
∴ speed = 12250 ÷ 3600 ≈ 3.4 m/sec (meter per second)
===================================================================
<u>Answer of question (2):</u>
Distance = 75 km
Time = 15 hours
Average speed = Distance ÷ Time = 75 ÷ 15 = 5 km/hr (kilometer per hour)
===================================================================
<u>Answer of question (3):</u>
Distance = 25 km
Time = 2.5 hours
Average speed = Distance ÷ Time = 25 ÷ 2.5 = 10 km/hr (kilometer per hour)
===================================================================
<u>Answer of question (4):</u>
Speed = 800 km/hr
Distance = 4000 km
Time = Distance ÷ Speed = 4000 ÷ 800 = 5 hr.