If the speed of a car is 20 m s^-1 then what is its speed in km h^-1 ?

72 km/hr

Step-by-step explanation:

Solution:

1 km = 1000m ⇒ 1m = 1/(1000)m

1 hr = 3600 sec ⇒ 1 sec = 1/ (3600) hr

Now we have to–

Note: While converting from m/s to km/hr we can directly multiply by the fraction (18/5)

since proposition states that a number is greater than 25, if is true then the number must actually be greater than 25.

this implies that all possible options, except 24, can be accepted