Question

Tali jogs a mile in 12 minutes. How many miles per hour is Tali running?

Answer 1

Tali is running at 5 miles per hour. In 12 minutes she runs 1 mile, in 1 minute she runs 1/12 mile, so in 60 minutes (one hour) she would run 60/12 = 5 mph Sandra is running at 10 miles per hour, this is twice as fast as Tali (5 mph x 2 = 10 mph). It takes Sandra 6 minutes to run a mile. Sandra runs 10 miles in an hour, so to run one mile would take her one tenth of an hour or 6 minutes.