Mariko and Issei drive to work. Mariko drives 72 miles in 2.25 hours. Issei drives 226 km in 2 hour 30 minutes. Work out the difference between their average speed in km/h. 1 mile = 1.6 km

39.2 km/hr.

Step-by-step explanation:

Given,

Mariko distance to work = 72 mile

1 mile = 1.6 Km

72 mile = 1.6 x 72 = 115.2 km

time taken to cover this distance = 2.25 hr

Average speed of mariko = 115.2/2.25 = 51.2 km/hr

Issei distance to work = 226 Km

time taken by issei = 2.5 hr

Average speed of issei = 226/2.5 = 90.4 Km/hr

Difference between their average speed

= 90.4 - 51.2 = 39.2 km/hr

Hence, the average speed difference is equal to 39.2 km/hr.