Question

A marathon covers 26 miles and 385 yards. If a runner averages 1.8 meters per second, how long in hrs will it take to complete the marathon?

Answer 1

A marathon is 42.195 km
= 42,195 m

time = 42195/1.8 = 23441.666..
seconds
= 6.5116 hrs or 6 hours and 31 minutes

or
1.8 m/s
= 64800 m/h
= 6.48 km/h

rate = 42.195/6.48 hours = 6.5116 hrs as above

or

1.8 m/s
= 180 cm/s
= 70.866.. inches/s
= 5.90551... ft/s ,(stored in calculator's memory)

26 miles and 385 yards
= 26(5280) + 3(385) ft
= 138435 ft

rate = 138435/5.90551.. = 23441.66 seconds
= 23441.66/3600 hours
= 6.5116 hrs, same as above

(Editorial: of course most serious runners would only think in metric and this kind of conversion problem does not exist for them)