SOLUTION: sam salesman has to get from point a to point b in 2.75 hours and 200 miles. sam takes the interstate and averages around 75 mph for the first 120 miles of his journey. what averag

Algebra.Com
Question 1144803: sam salesman has to get from point a to point b in 2.75 hours and 200 miles. sam takes the interstate and averages around 75 mph for the first 120 miles of his journey. what average speed must sam drive during the remainder of the time in order to get there in time ?
Found 2 solutions by greenestamps, josgarithmetic:
Answer by greenestamps(13200)   (Show Source): You can put this solution on YOUR website!


The first part of the journey is 120 miles at 75mph. That leaves 80 miles for the second part.

(1) Determine the amount of time for the first part of the journey (time = distance divided by rate)

(2) Determine the amount of time remaining (total time 2.75 hours)

(3) Determine the speed required for the second part (speed = distance divided by time)
Answer by josgarithmetic(39617)   (Show Source): You can put this solution on YOUR website!
PART              SPEED       TIME         DISTANCE

interstate           75        120/75         120

remainder            r          80/r           80

TOTALS                          2.75          200


Solve for r.
RELATED QUESTIONS

Elly and sam are jogging. Elly runs from point a to point b in one hour at 2MPH faster... (answered by stanbon)
Sam and Alisha are each driving to a concert in a nearby city, 126 km away. Sam has a... (answered by josgarithmetic)
HELP PLEASE A KAYAKER SPENDS 2 HOURS PADDLING UP A STREAM FROM POINT A TO B. QUICKLY... (answered by macston,Theo)
Sam and Bob both repair machines. Sam can repair one machine 5 hours faster than Bob can (answered by ptaylor)
A man finds that he can reach a certain town in 6 hours by traveling 240 miles on an... (answered by greenestamps)
Leona Jackson and Sam Peterson love to walk. Leona walks 5 miles per hour. Sam walks 6... (answered by greenestamps,josgarithmetic,ikleyn)
a plane is going from point a to point b. the distance is 200 miles and the plane is... (answered by Alan3354)
It takes a Train X 2 hrs less than it takes Train Y to make the Trip from Point A to... (answered by Paul)
Sam drove at a constant rate of 72 miles per hour on the interstate for 6 hours and 15... (answered by Alan3354)