Answer:
John read for 3 hours
Explanation:
Mike read 6 hours. Sasha doubled the reading time so 3*2=12. Tom read half of that time, so it is the same as Mike which is 3. John read half of Tom's time, so 6 divided by 2 is 3.
j = 0.5t; t = 0.5s; s = 2m; m = 6
s=2(6), s=12; t=0.5(12), t=6; j=0.5(6), j=3
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