(b) 1.80 m/s2 due west m/s east 2.4 points Two friends, Amar and Robert can run
ID: 1405674 • Letter: #
Question
(b) 1.80 m/s2 due west m/s east 2.4 points Two friends, Amar and Robert can run at a speed of 6.4 mi/hr and walk at a speed of 3.5 mi/hr. They set off together on a route of 5.00 miles. Amar decides to walk half the distance and run the other half, while Robert decides to walk half the time and run the other half. (a) How long does it take Amar to cover the 5.00 miles? minutes (b) Find Amar's average speed. mi/hr (c) How long does it take Robert to cover the 5.00 miles? minutes (d) Find Robert's average speed. mi/hr abrmit Answer/ SaveProgress Practice Another Version. 0.6/1.5 points 1 Previous Answers (a) If a square has its area decreased to a factor of 1/3 of its original size, then by what factor did each side decrease? 0 577 If the diameter of a sphere is increased by 25% by what percentage of the original volume does the sphere increase to?Explanation / Answer
a) total time taken, T = time taken for walk + time taken to run
= 2.5/3.5 + 2.5/6.4
= 1.1 hour
= 66.3 min <<<<<<<----------Answer
b) Vavg = total didtsnace/total time taken
= 5/1.1
= 4.55 mi/hr <<<<<<<----------Answer
c)
total time taken, T = d/Vavg
= d/(v1+v2)/2
= 2*d/(v1+v2)
= 2*5/(3.5+6.4)
= 1.01 hour <<<<<<<----------Answer
d) Vavg = d/T
= 5/1.01
= 4.95 mi/hr <<<<<<<----------Answer
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