a boy leaves his house at 8:45 a.m and walks to school 1.25 km away he arrives at school at 9:20 a.m. what is his average speed
Answers
ANSWER (1) : Answer in meters per minutes:
Time spent on the journey:
8.45 am to 9.20 am = 35 mins
Find the speed:
Distance = 1.25 km = 1250 m
Speed = Distance ÷ Time
Speed = 1250 ÷ 35 = 35.7 m/mins
Answer: The average speed is 35.7m/min
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ANSWER (2) : Answer in km per hour
Time spent on the journey:
8.45 am to 9.20 am = 35 mins
35 mins = 35/60 = 7/12 hour
Find the speed:
Distance = 1.25 km (Given)
Speed = Distance ÷ Time
Speed = 1.25 ÷ 7/12 = 2.14 km/h
Answer: The average speed is 2.14 km/h
When does he leave the house ? = 8 : 45
When does he arrive ? = 9 : 20
The difference = 35 minutes
The distance from his house to school - 1.25 km
Let us convert the 35 minutes to hours.. A speed formula shall always be
meters / seconds ( or ) kilometers / hour
35 min into hours
= 35 / 60
= 7 / 12 hours
Distance = 1.25 km
Average speed = total distance / total time
total distance = 1.25 km
total time = 7 / 12 hours
Average speed = ( 1.25 ) ÷ ( 7 / 12 )
1.25 × ( 12 / 7 )
2.14 kilometers per hour