jamie rides her bike from her apartment to the park and back each saturday. the distance from her apartment to the park is 7.2 miles. jamie can ride quickly on the way to the park, pedaling at 6 miles per hour the whole way there. on the way back to the apartment, she pedals slower, at 4 miles per hour. not counting the time she spends at the park, how long does it take jamie to make the round trip from her apartment to the park and back? a.180 minutes b.172.8 minutes c.144 minutes d.24 minutes