Question

jessica needs 3 1/2 hours for preparing lasagna. she wants to serve the lasagna at 7:15. what time should she start to prepare the lasagna?

Answer 1

GIVEN - IT TAKES JESSICA
$3 \frac{1}{2} \: \: hours \: \: to \: \: prepare \: \: the \: dish$

Subtracting 3 hours and 30 minutes from 7:15, we get

3:45

So, Jessica should start cooking LASAGNA at

3:45 p.m if she will serve at 7:15 p.m

OR

3:45 a.m if she will serve it at 7:45 a.m.
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Hope this helps!!!!