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-BARSIC- [3]
3 years ago
12

Mike hiked to a lake in 5.5 hours at an average rate of 2 1/5 miles per hour. Pedro hiked the same distance at a rate of 2 3/5 m

iles per hour. How long did it take Pedro to reach the lake?Round to the hundredth place. It took Pedro ____ hours to reach the lake.
Mathematics
1 answer:
Leni [432]3 years ago
6 0

Answer:

3.5 hours*3.25 mph=11.375 miles

11.375 miles/3.45 mi/hr=3.297 hours or 3.30 hours, about 12 minutes faster.

Step-by-step explanation:

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3 years ago
Carlos has a box of coins that he uses when playing poker
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Step-by-step explanation:

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2 years ago
Liam is making barbecue ribs over a fire. The internal temperature of the ribs when he starts cooking is 40°F. During each hour
Soloha48 [4]

Answer: You need to wait at least 6.4 hours to eat the ribs.

t ≥ 6.4 hours.

Step-by-step explanation:

The initial temperature is 40°F, and it increases by 25% each hour.

This means that during hour 0 the temperature is 40° F

after the first hour, at h = 1h we have an increase of 25%, this means that the new temperature is:

T = 40° F + 0.25*40° F = 1.25*40° F

after another hour we have another increase of 25%, the temperature now is:

T = (1.25*40° F) + 0.25*(1.25*40° F) = (40° F)*(1.25)^2

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T(h) = (40°f)*1.25^h

now we want to find the number of hours needed to get the temperature equal to 165°F. which is the minimum temperature that the ribs need to reach in order to be safe to eaten.

So we have:

(40°f)*1.25^h = 165° F

1.25^h = 165/40 = 4.125

h = ln(4.125)/ln(1.25)  = 6.4 hours.

then the inequality is:

t ≥ 6.4 hours.

4 0
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