Question

a car covers a distance in 30 minutes with an average speed of 60 km per hour what should be the average speed to cover the same distance in 20 minutes​

Answer 1

answer :

explanation : in first case

time = 30 minutes = 30 /60 hrs = 1/2 hr

speed = 60 km /hr

therefore the distance = speed × time

60 × 1/2 = 30 km

second case

distance is same = 30 km

time = 20 minutes = 20/60hr = 1/3 hr

speed = distance / time

30 / (1/3)= 30 ×3 = 90 km / hr

Answer 2

time equals to 30 minutes

1 minut equals to 60 minut is equals to 30/60hr=1/2hr

speed is equals to 60 km/HR

distance is equals to speed into time

60*1/2=30km

and ..

distance same in 30 km

time is equals to 20 minute

=20/60hr=1/3hr

speed =distance ×time

30/(1/3)=

30×3=90km/HR.....

thank you