Mike and Fritz ran a 30-mile Marathon. Mike ran 10 miles at 10 miles per hour and then ran at 5 miles per hour for the remaining 20 miles.Fritz ran the first one-third (by time) of the run at 10 miles per hour and the remaining two-thirds of the run at 5 miles per hour. How much time in hours did Fritz take to complete the Marathon?
Choose the most appropriate option:
A) 3
B) 3.5
C) 4
D) 4.5
E) 5
Let total time= t   F travelled at rate 10mph for t/3 time and 5mph for 2t/3 time   d= s1t1+s2t2   30= 10*t/3 + 5*2t/3   30= 20t/3   t= 4.5   4.5 is the answer
<result>D</result>
Mike and Fritz ran a 30-mile Marathon. Mike ran 10 miles at 10 miles per hour and then ran at 5 miles per hour for the remaining 20 miles.Fritz ran the first one-third (by time) of the run at 10 miles per hour and the remaining two-thirds of the run at 5 miles per hour. How much time in hours did Fritz take to complete the Marathon?