SOLUTION: while driving home from school you travel at 100 km/h for 120 km then slow to 60 km/h you get home in 2 hours.
1: How far is you home town from school?
2: What is the average spe
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Question 1070353: while driving home from school you travel at 100 km/h for 120 km then slow to 60 km/h you get home in 2 hours.
1: How far is you home town from school?
2: What is the average speed?
Found 2 solutions by rothauserc, josmiceli:
Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
rate * time = distance
:
t(1) = 120 / 100 = 1.2 hours
:
t(2) = 2 - 1.2 = 0.8 hours
:
60 * 0.8 = 48 km
:
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total distance is 120 + 48 = 168 km
***********************************
:
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average speed = 168 / 2 = 84 km/hour
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:
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = distance in km traveled at km/hr
------------------------------
(1)
Multiply both sides of the equation by
-----------------
km
The home town is 168 km from school
----------------------------------------
(2)
Average speed is always
[ total distance traveled ] / [ total time spent traveling ]
The average speed is 84 km/hr
-----------------------------
Check my math and get another opinion if necessary
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