a. Thomas left Miami and drove at the speed of 41 mph. Katherine left 1 hour and 28 minutes later and drove at the speed of 57 mph. How long it take Katherine to catch up with Thomas?
b. EdHelper Airlines flight H3488 from Boston to Dallas averaged the speed of 90 mph more than return trip back to Boston. Return trip took 1 109/308 times longer than trip going to Dallas. Distance between Boston and Dallas is 1750 miles. Determine average speed from Dallas to Boston?