Question

express each of the following speeds in kilometre per hour. a) 60 m per minute. b) 15 metre per second. c) 90 m per minute​

Answer 1

we know,

• 1 km=1000 m

so:-

$\\ \\ \\ \frac{60}{1000} = \frac{6}{100} km$

And:-

we know,

• 1 hour =60 min

so,

$\\ \\ \\ 1 \: min \: = \frac{1}{60} hours$

Now ,

$\\ \\ \\ \\ = \frac{6}{100} \div \frac{1}{60} \\ \\ \\ = \frac{6 \times 60}{100} \\ \\ \\ \\ = 3.6 \: km hr$

Answer 2

60/1×1000/60 =1000m/hr=1km/hr

15/1×5/18 = 4.17 km/hr

90/1×1000/60 = 1.5km/hr