by 1; 00 pm a total of 40 boxes has been unloaded from a delivery truck. by 3:30 pm a total of 65 boxes has been unloaded from the same truck. if boxes are unloaded from the truck at a constant rate, what is the total number of boxes that will have been unloaded from the truck by 7:00pm

100 boxes

Step-by-step explanation:

Time difference between 3:30pm and 1:00 pm is 2 hours 30 mins or 2.5 hours.

Boxes loaded between this duration are 65-40=25 boxes

Rate of loading boxes are 24/2.5=10 boxes per hour.

Time difference between 7pm and 1 pm is 7-1=6 hours

Initial boxes unloaded (by 1 pm) = 40 boxes

For 6 hours, using the rate of 10 boxes per hour, unloaded boxes will be 6*10=60 boxes

Total boxes will be 60+40=100 boxes

By 7pm of the same day, 100 boxes will be unloaded.