Solve
-Two Bicyclists, One Averaging $10 \mathrm { mph }$ And One Averaging

Multiple Choice

Solve.
-Two bicyclists, one averaging $10 \mathrm { mph }$ and one averaging $16 \mathrm { mph }$ , start from the same point. The slower bicyclist arrives at the end of the course a half-hour after the other bicyclist. Find the distance of the ride. Round to the nearest whole mile.

A) $21 \mathrm { mi }$
B) $8 \mathrm { mi }$
C) $13 \mathrm { mi }$
D) $\frac { 5 } { 6 } \mathrm { mi }$