Question

Distance is 20 km time is 30 minutes find speed in km per hour

Answer 1

distance = 20km
time = 30 minutes = 1/2 hour
speed = distance/time
= 20/0.5
= 40 km/h

Answer 2

Hey friend nice question.
Speed = distance /time
Distance =20 km
Time = 30 mins =30/60 = 1/2
Distance = Speed = 20 / 1 / 2
$20 \times 2 \div 1 = 40$
Speed = 40 km h