Bunuel wrote:

dave13 wrote:

Bunuel how did you calculate time ?

1/12 ...does it means that it takes 5 minutes for every 12 miles ?

5 minutes is 1/12 hour.

hi

Bunuel, if i change 5 minutes into 10 minutes interval.

so:

first interval the speed id 20 km per hour

second interval is 30 km per hour

third interval is 40 km per hour

Speed = \(\frac{40 km (distance)}{60 minutes (time)}\)

Time in 10-minute interval, means what distance did the car in 10 minute interval at a speed of 40 km per hour.

Time = \(\frac{distance}{speed}\)

Distance = \(speed * time\) ---> \(\frac{40 km (distance)}{60 minutes (time)}\) * 10 = 6,7 miles

Is my understanding correct ?

thank you