Question

Three slices of bread are to be toasted under a grill. The grill can hold two slices at once but only one side is toasted at a time. It takes 30 seconds to toast one side of a piece of bread, 5 seconds to put a piece in or take a piece out and 3 seconds to turn a piece over. What is the shortest time in which the three slices can be toasted?

Answer 1

175 seconds,

32 slices of toast

Explanation:

20/5 = 5 times

5 (35) = 175 Seconds to make 20 slices of toast

2---------> 35 seconds to make 4 pieces of toast

60 (4) = 240

240 + 40 = 280

35/280 = 8

8 (4) = 32 slices of toast

So, Anwers are:

1---------> 175 seconds to make 20 slices of toast.

2----------> 32 slices of toast they can make as many times as possible in

4 minutes and 40 seconds.

Hope that helps!!!!!! :)

02/16/2021

Answer 2

159 seconds. The 1st two slices of bread will take 60 seconds to toast. 20 second to put in and out. And 6 seconds to turn them over. The 3rd piece will take 60 seconds to toast, 10 seconds to put in and out, and 3 seconds to turn over. 86 seconds + 73 seconds= 159