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ANEK [815]
2 years ago
14

A man ran 20 miles in 2 hours. Calculate the average time that it took the man to run each mile in minutes.

Mathematics
1 answer:
konstantin123 [22]2 years ago
3 0

Answer:

he ran 3 miles in 8 mins

Step-by-step explanation:

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Please answer all with explanation
stepladder [879]

3b.4+y/3=2

12+y/3=2

12+y=6

y=6-12

y=-6

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8 0
2 years ago
A lighthouse is built on an exposed reef, 4.5 miles off-shore. The shoreline is perfectly straight, and a town is located 6 mile
Alisiya [41]

Answer: 3.94 hours

Step-by-step explanation:

From the question, the following parameters are given:

Distance offshore = 4.5 miles

Distance downshore = 6 miles

Speed when running = 3.4 mph

Speed with boat = 1.8 mph

distance of boat rowing = sqrt(4.5^2 + x^2)

Where

Speed = distance/time

Time = distance/speed

Time = distance of boat rowing/1.8

distance of running = 6 - x

Time = (6-x)/3.4

total travel time

t = sqrt(4.5^2 + x^2)/1.8 + (6 - x)/3.4

dt/dx = x/(1.8×sqrt(4.5^2 + x^2) - 1/3.4

d^2t/dx^2 = +ve at any x

x is at its minimum when dt/dx=0

x/(1.8×sqrt(4.5^2 + x^2) = 1/3.4

x = 6/sqrt(253) × 4.5 = 1.697 miles

Substitute x in

t = sqrt(4.5^2 + x^2)/1.8 + (6 - x)/3.4

We obtaine

t = sqrt(4.5^2 + 1.697^2)/1.8 + (6 - 1.69)/3.4

t = 2.672+ 1.266 = 3.94 hours

7 0
3 years ago
Find 5 rational numbers between -3/4 and 5/6
insens350 [35]

Answer:

1/2, 1/3, 1/4, 1/5, 1/6

Step-by-step explanation:

6 0
3 years ago
I need help with b. please
aniked [119]
Its 1/5, 

35/100 - 15/100 = 20/100

for 20, 40, 60, 80, 100
      1,   2,   3,   4,   5

so 20/100 = 1/5
8 0
2 years ago
What is the answer for n-29=-53
bija089 [108]

Answer:

n=-24

Step-by-step explanation:

4 0
3 years ago
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