10 km. 15 mins. Learning Task 2: Calculate the Speed, distance and Time. Janna cycles 20 miles on her bike in 2 hours and 30 minutes. Calculate her average speed in mph. 1. Elena drives for 3 hours at 44mph. Claire drives 144 miles in 4 hours. How far would Elena travel if she drove for 3 hours at the same speed as Claire? 2. Janet and Andrew leave their home at the same time. Janet has 60 miles to travel and drives at 40 mph. Andrew have 80 miles to travel and also drives at 40 mph. (a) How long does Janet's journey take? (b) How much longer does Andrew spend driving than Janet?​