The ratio of the number of red marbles to the number of green marbles in a bag is 2:3 the ratio of the number of green marbles to the number of blue marbles is 9:4 there are 76 marbles in a bag

Martha is training for a duathlon, which includes biking and running. she knows that yesterday she covered a total distance of over 55.5 miles in more than than 4.5 hours of training. martha runs at a speed of 6 mph and bikes at a rate of 15.5 mph.