A car travelling at 30km/h complete a journey in 2 1/2 hour. How long will it take to complete the same journey if the speed is decreased to 20 km/ h

Question

How to solve inverse proportion using average speed and distance. For primary 5 ratio and proportion

Answer 1

distance = rate*time

 

d = 30(2.5) = 75 km

 

Decreasing rate to 20 km/hr gives:

 

75 = 20t

t = 75/20

t = 3 3/4 hours