Question

A has covered 1/3 of total distance when his scooter failed 22

Answer 1

Probably the easiest was to think of this is to get rid of any fractions. By multiplying the two distances by 3

13d∗3=d

23d∗3=2d

Now work out the amount of time it takes to cover each distance.

at 3km/h it takes d3 units

at 2km/h it take 2d2 or d units

so to cover 3d km it will take 43d hours

Finally we divide the two terms, d cancels out altogether and we’re left with

3∗34

which is 2.25km/h