Random Math Problem

Random Math Problem 1) A boy start walking to school at 8am at the rate of 3 miles per hour. At 10am his brother start for school in his bicycle at 12 miles per hour. When will the boy on the bicycle overtake his brother? 2) 75 is what percent of 7500? 3) If an airplane takes off at 600 mph and a second plane takes off 2 hours later with same direction at speed of 800 mph. How many hours will it take for 2nd plane to reach the 1st plane?