Can you help me solve this, step by step?

Question

Triathlon: You travel 185.5 miles while swimming, biking, and running in a triathlon. Diagram shows the following;

 

Swimming = 2 miles/ 15 mins.

Biking= 16 mikes/ 45 mins.

Running= 6 miles/ ? mins.

 

Write & solve an equation to find how many minutes you spend running. book answer says it should = 15.5 miles, 30 mins.????? How?

 

(7th grade Math)

Answer 1

total 185.5 miles

how many minutes running 6 miles?? 15.5 in 30 minutes?

given

2 miles in 15 minutes swimming

16 miles in 45 minutes biking

2 miles in 15 minutes =8 mph

15 miles in 3/4 hour = 20 mph

15.5 miles in 1/2 hour = 31 mph

185.5 = 15.5 + 170. 170=80+90. 10 hours swimming 4 1/2 hours biking 1/2 hour running

is one possibility

if 15.5 hours in 1/2 hour, that's equivalent to 6 miles in 31/360th of an hour = about 11.6 minutes