Question

Aeroplane goes from country a to country b with an average speed of 450 km/h and returns with an average speed of 300 km/h. find the distance between two countries if the flight takes 15 hours in all.

Answer 1

To find the distance you need to multiply the speed by the time. The total aeroplane time is 15 hours and he has taken two plane trips so divide this by two, this give you 7.5 hours.

450 x 7.5 = 3,375 km
300 x 7.5 = 2,250 km

Then add them together
5,625km is the total distance