Based on the information given, it should be noted that Liz will stop exercising at 5.15 p.m.
Since Mike exercised for 90 minutes and Liz exercised half an hour less than Mike. Then, the number of minutes used by Liz will be:
= 90 - (1/2 × 60)
= 90 - 30
= 60 minutes = 1 hour
Now, the time that Liz stopped exercising will be
= 4.15pm + 1 hour
= 5.15 pm
Liz will stop exercising at 5.15 p.m.
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