Question

express speed in km/hm of 20m/sec​

Answer 1

Answer:

72 m/sec

Step-by-step explanation:

20 m/sec. It can be expressed in km/h by multiplying it into 18/5.

⇒18/5×20

⇒18×4

⇒72 m/sec

Answer 2

$\huge\fcolorbox{red}{cyan}{72\:km/h}$

Step-by-step explanation:

• 1 m = 1/1000 km

• 1 sec = 1/3600 h

$20m/sec = \frac{\frac{20}{1000}}{\frac{1}{3600}} \\ =>\frac{20 \times 3600}{1000} \\ => \frac{20 \times 18}{5} \\ => 4 \times 18 \\ => \boxed{72\:km/h}$

Hope it helped