5
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Express each of the following speeds in km/h.
(a) 60 m per minute (b) 15 m per second
(c) 90 m per minute
Answers
Answered by
23
Answer:
We need to change the following Speeds into km/h
- 1minute = 60 seconds
- 1 hour = 60 minutes
- 1 hour = 60 × 60 seconds
- 1m = 1/1000 km
(i) 60m/minutes
= (60/ 1000 )/(1/60)
= 6/100 × 60/1
= 6/10 × 6
= 36/10
= 18/5
= 3.6 km/h
(ii) 15m/s
= (15/1000)/(1/3600)
= 3/200 × 3600
= 3 × 18
= 54km/h
(iii) 90m/minute
= (90/1000)/(1/60)
= 9/100 × 60
= 9/5 × 3
= 27/5
= 5.4 km/h
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Answered by
4
Step-by-step explanation:
15minutes
=(15/1000)(1/3600
=3/200×3600
=3×18
=54km/h
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