Question

The Grand Prix Formula 1 race this weekend is in Singapore. The race consists of 61 laps

around a 5.067 km long track. At 225 miles per hour, how long will it take to go around
once?

Answer 1

Total distance traveled is 61(5.067 km) = 309.087 km. Convert 225 mph into km/hour:

225 mph (1.6 km)
[-------------- ] = 360 km/hr
1 mile

Now divide 309.087 km by 360 km/hr:

309.087 km
---------------- = 0.86 hour (about 51.5 minutes)
360 km/hr

Answer 2

225 mph

1 hr = 3600 sec

1.6 km = 1mile

1 lap = 5.067 km

multiply all the numbers divided by conversions:

225/1 * 1/3600 * 1.6/1 * 1/5.067 = 0.0197 laps / sec


1 / 0.0197 = 50.67 seconds per lap