Question

5
.
Express each of the following speeds in km/h.
(a) 60 m per minute (b) 15 m per second
(c) 90 m per minute​

Answer 1

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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Answer 2

Step-by-step explanation:

15minutes

=(15/1000)(1/3600

=3/200×3600

=3×18

=54km/h