unit 1 assessment relationships between quantities

Question

In a test, engineers determined that a bicycle can travel at a top speed of 20 feet per second . What is the top speed the bicycle can travel in miles per hour? (1 mile 5 5,280 feet)

A.    0 .004 mile per hour
B.    0 .23 mile per hour
C. 13 .6 miles per hour
D. 105,600 miles per hour

Answer 1

For this question we have to do a series of conversion changes. We are trying to convert feet/s to miles/h, so to begin let's convert the feet to miles.

 

20 feet/s * 1 mile/5280 feet= 0.00378

 

Next we convert the seconds to hours:

 

0.00378 miles/s * 60 seconds/1minute * 60 minutes/1 hour=13.6 miles/hour.

 

Therefore the answer would C.