Let's sum these two numbers.
10 + 40 = 50 total hours.
In every 12-hour the clock format changes AM to PM or the opposite PM to AM. So we need to divide 12 with the result 50.
There are 4 times 12 number in the 50
If the result is ODD number the time format will change the opposite side. If the result is EVEN number the time format will be the same.
Answer :2pm
What is 40 hours from 10pm ? = 2pm.
Add 40 hours to 10pm is equal 2pm.