Question 123
Maria is planning to participate in the Triatlon-Brasil that is included in the $800~\mathrm{m}$ of swimming, followed by the $20~\mathrm{km}$ by bicycle and, finally, $4~\mathrm{km}$ of racing. Maria runs at a constant speed that is triple the speed at which nothing and pedals 2.5 times faster than she runs. To finish the race in a maximum of 1 hour and 20 minutes, what should be your minimum speed in each of the three modalities?