The men's world record for running a mile outdoors (as of 1999) is 3 min 43.13 s. At this rate, how long would it take to run a 2 km race (1 mi = 1609 m) ?

4 min 37.35 seconds

Explanation:

Given:

Time taken to run 1 mile = 3 min 43.13 seconds

1 min = 60 seconds

thus,

3 min = 180 seconds

therefore total time taken to run 1 mile = 180 + 43.13 = 223.13 seconds

Now,

1 mi = 1609 m

1 km = 1000 m

thus,

1 mi = 1.609 Km

or

1 km = 0.6215 mi

therefore,

2 km = 0.6215 * 2 = 1.243 mi

hence, the time taken to run 2 km (1.243 mi) = 223.13 * 1.243 = 277.35 seconds = 4 min 37.35 seconds