randy has alot of home work tonight for 45 minutes on social studies 40 minutes on science and 1 hour and 15 minutes on math. it will also take him 10 minutes to get ready for bed. if he wants to be in bed at 10:00 what time does he need to start his homework

He need to start his homework from 7:10 sharp if he want to be in bed at 10:00.

Step-by-step explanation:

Given Details are,

Time Required for social studies homework = 45 minutes

Time Required for science homework = 40 minutes

Time Required for math homework = 1 hour 15 minutes = 75 minutes

Time Required to get ready for bed = 10 minutes

Time when she will be on bed = 10 : 00

To find: Time when he start his home work.

Sum of all the given time (in minutes) = 45 + 40 + 75 + 10 = 170 minutes

170 minutes = 2 hours 50 minutes

2 hours before of 10:00 = 8:00

50 minutes before of 8:00 = 7:10

Therefore, He need to start his homework from 7:10 sharp if he want to be in bed at 10:00.