Can someone please help me understand ?

Mathematics
Tutor: None Selected Time limit: 1 Day

A commuter regularly drives 70 miles from home to work, and the amount of time required for the trip varies widely as a result of road and traffic conditions. The average speed for such a trip is a function of the time required. For example, if the trip takes 2 hours, then the average speed is 
70
2
 = 35

 miles per hour.

(a) What is the average speed if the trip takes an hour and a half? (Round your answer to three decimal places.)

(b) Find a formula for the average speed s as a function of the time t required for the trip.

Sep 24th, 2015

Thank you for the opportunity to help you with your question!

Average speed for one and half hours:

(a) What is the average speed if the trip takes an hour and a half? (Round your answer to three decimal places.)

One and half hours is 1.5 in decimal

The average speed is 70/1.5

=700/15

= 46.667

(b) Find a formula for the average speed s as a function of the time t required for the trip.

Speed=Distance/time

 Average Speed:  f(t)= 70/t


Please let me know if you need any clarification. I'm always happy to answer your questions.
Sep 24th, 2015

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