Question

The respective ratio between the speeds of a car, a scooter and a tractor is 5:3:2. The tractor covers 150 km in 5 hours. What is the average of speeds of car and scooter together?

Answer 1

Answer:

60 kmph

Explanation :

Tractor covers 150 km in 5 hours

Speed of tractor = 150/5 = 30 kmph

According to the question ratio of speed of car,scooter and tractor is 5:3:2

let the common ratio is x,

So, speed of car = 5x

Speed of scooter = 3x

and speed of tractor = 2x

speed of tractor is calculated previously

So,compare both speed 2x = 30

x = 15

speed of car = 5 × 15 = 75 kmph

Speed of scooter = 3 × 15 = 45 kmph

Average speed of car and scooter = (75+45)/2

= 120/2

= 60 kmph