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jhenifelix
16.07.2019 •
Mathematics
Aman drove to work at an average rate of speed 60 miles per hour and returned over thesame route driving at an average rate of speed of 40 miles per hour. if his total driving time was 1 hour, what was the total number of miles in the round trip?
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Ответ:
let x = miles
we have x miles/ 60mph plus x miles / 40 mph = 1 hour
x/60 + x/40 = 1
we need to calculate 2x for the round trip
calculate common denominator and rewrite the 2 fractions:
2x/120 + 3x/120 = 1
5x= 120
x = 120/5 = 24 miles
24*2 = 48 miles total
check:
1 way would be 48/2 = 24 miles
24/60 = 0.4 hours to drive 24 miles at 60 mph
24/40 = 0.6 hours to drive 24 miles at 40 mph
0.6 +0.4 = 1 hour
Ответ:
answer:
b. to complete the square for the x terms, add 4 to both sides.
c. the center of the circle is at (–2, 3).
step-by-step explanation: