Answer:
4
Step-by-step explanation:
Answer:
20,365.7 seconds
Step-by-step explanation:
First, we need to know how to convert yards to miles, as the question is in miles. We know that 1 mile is equivalent to 1760 yards. So we have:
1 mi = 1760 yards
If we multiply both sides by 81:
81 mi = 142,560 yards
And we know that the sprinter needs 8 second to run 56 yards:
8 s = 56 yards
If we divide both sides by 56 we get the time he needs for 1 yard:
8/56 s = 56/56 yards
1/7 s = 1 yard
So, takes him 1/7 seconds to run one yard. At this rate he runs 142,560 yards in:
(1/7) * 142,560 = 20,365.7
So, he needs 20,365.7 seconds to run 81 miles (142,560 yards)
<h2><u>Given</u> : - </h2>
x = 2 & z = 3x
<h2><u>Solution</u> : - </h2>
<h3>⇒x + 4z - 5 - 3x</h3>
<h3>⇒(2) + 4(6) - 5 - 3(2)</h3>
<h3>⇒2 + 24 - 5 - 6</h3>
<h3>⇒26 - 11</h3>
<h3>⇒15</h3>