A boat travels 36 miles in 1.5 hours and then 14 miles in 0.75 hours what is the average speed of the boat

Since 1.5 hours is an hour and a half, and 0.75 hours is forty-five minutes, in an hour and a half 36 miles is travelled, plus 14 miles in 45 more minutes, the average speed of the boat is 50 miles/2 hours and twenty-five minutes.