Question

Rachel and Marc drive to work.
Rachel drives 90 miles in 1.25 hours.
Marc drives 244 km in 2 hour 30 min.
Work out the difference between their average speeds in km/h.
1 mile = 1.6 km

Answer 1

Answer:

17.6 km/h

Step-by-step explanation:

Given that, 1 mile = 1.6 km

Therefore, 90 miles = 90*1.6 km = 144 km

Here, 2 hours 30 mins = 2 hours + 30/60 hours

= 2 hours + .5 hours = 2.5 hours

Now, Rachel's average speed = 144/1.25 km/h = 115.2 km/h

And, Marc's average speed= 244/2.5 km/h = 97.6 km/h

Therefore, the required difference = (115.2 - 97.6) km/h

= 17.6 km/h