Question

RES

Town Q and Town P were 119 km apart. Van drove from
Town Q to Town P at an average speed of 70 km/h. How
much sooner would he have arrived at Town P if he had
travelled at an average speed of 85 km/h instead?
min​

Answer 1

18 minutes earlier

Explanation:

Given

`Distance =119km`

`Speed\ 1 = 70km/h`

`Speed\ 2 = 85km/h`

Required

Determine how much sooner if traveled at speed 2 instead of speed 1

Speed is calculated as:

`Speed = (Distance)/(Time)`

Make Time the subject

`Time= (Distance)/(Speed )`

For Speed 1

`Time= (119km)/(70km/h)`

`Time= 1.7hr`

For Speed 2

`Time= (119km)/(85km/h)`

`Time= 1.4hr`

Calculate the difference

`Difference = 1.7hr - 1.4hr`

`Difference = 0.3hr`

Convert to minutes

`Difference = 0.3*60\ min`

`Difference = 18\ min`

If traveled at 85km/h, the van will arrive 18 minutes earlier