Jack had

Jack had 4 hours of school.

He spent 45 minutes in the library and 1/2 hour on a science lecture and had a lunch break of 25 minutes.

How much time is left for the school to get over? (Write the answer as a fraction.)

Correct answer:

x =  7/3 = 2 13 h

Step-by-step explanation:

s=6045+21+6025=6045+6030+6025=6045+30+25=60100=351.6667 h  x=4s=435=34 335=31235=3125=37=37 h=2.3333 h

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