A cyclist rides his bike at a speed of 27 miles per hour. What is this speed in feet per second? How many feet will the cyclist travel in 15 seconds? In your computations, use the fact that 1 mile is equal to 5280 feet. Do not round your answers.
5 answers
27mi/hr * 5280ft/mi * 1hr/3600s = ? ft/s
Im. Sorry but I still don't get it?
/ means divide
* means multiply
* means multiply
No. Im not understanding what to do with the 3 numbers or how u got them.?
you have mi/hr
You want ft/s
1 hour = 3600 seconds
1 mile = 5280 feet
So,
1mi/hr = 5280 ft/hr
= 5280ft/3600s = 5280/3600 ft/s
your speed is 27 mi/hr, so that is
27*5280/3600 = 29.6 ft/s
You can always multiply by 1 without changing anything. Since
1 mi = 5280 ft, that means that
5280ft/1mi = 1
You line up the ratios so that the units cancel, just like factors of a number.
3*2/2*7 = 2/7
the 2's cancel
27mi/hr * 5280ft/mi = 27*5280 ft/hr
the "mi" units (factors) cancel
You want ft/s
1 hour = 3600 seconds
1 mile = 5280 feet
So,
1mi/hr = 5280 ft/hr
= 5280ft/3600s = 5280/3600 ft/s
your speed is 27 mi/hr, so that is
27*5280/3600 = 29.6 ft/s
You can always multiply by 1 without changing anything. Since
1 mi = 5280 ft, that means that
5280ft/1mi = 1
You line up the ratios so that the units cancel, just like factors of a number.
3*2/2*7 = 2/7
the 2's cancel
27mi/hr * 5280ft/mi = 27*5280 ft/hr
the "mi" units (factors) cancel
2 answers