Question

A car with an average speed of 60 km/h takes 3 hours to travel some distance. What should be the decrease in speed if the same distance is to be covered in 4 hours​

Answer 1

Answer:-

In 1 hour the car goes 60 km

In 3 hour the car goes 60 × 3 = 180 km

But to cover 180 km distance there is needed 4 hour

So,4 ÷ 180 km

60 ÷ 45 = 15km.

Answer 2

Step-by-step explanation:

distance= speed x time

so 60x3=180km

speed required to cover same distance in 4 hours

= distance÷time = 180÷4 = 45km/h

decrease in speed = 60-45=15km/h