It takes Avery 2.5 hours to build a brick wall while Tom can do it in 4 hours. If the two start working together and after an hour Avery leaves, how much time will it take Tom to complete the wall on his own?  Pick one
A) 1 hour and 24 minutes.
B) 50 minutes.
C) 1 hour and 40 minutes.
D) 2 hours and 10 minutes
E) 1 hour and 20 minutes
1 hour and 24 minutes.very's efficiency is 100/2.5= 
<gadget id="calculator">100/2.5</gadget>
<output>40</output>
40%   Tom's= 100/4= 
<gadget id="calculator">100/4</gadget>
<output>25</output>
25%   they worked together for 1 hour and finished 65% of the job   remaining= 35 %   Tom will complete 25 % in 60 minutes , and   10% in   60*10/25= 
<gadget id="calculator">  60*10/25</gadget>
<output>24</output>
24 minutes   Time taken by Tom to finish the remaining on his own= 60+24= 
<gadget id="calculator">60+24</gadget>
<output>84</output>
84 minutes   1 hour and 24 minutes.NSWER:1 hour and 24 minutes.
<result>A</result>
It takes Avery 2.5 hours to build a brick wall while Tom can do it in 4 hours. If the two start working together and after an hour Avery leaves, how much time will it take Tom to complete the wall on his own?