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To determine when you will overtake your brother, we need to find the time it takes for the difference in your walking speeds to cover the distance between you. Since your brother leaves 5 minutes earlier and walks for 40 minutes, he will have covered 40/5 = 8 minutes of distance by the time you leave. You take 30 minutes to walk the same distance, so you gain 30-8 = 22 minutes on your brother every time you both leave. Therefore, you will overtake your brother 22 minutes after you leave, which would be at 7:22 AM.
In mathematical terms, you would be looking to divide 22 by 40. When you perform this division, you would find that 40 does not go into 22 evenly. The quotient would be 0 with a remainder of 22. So, technically speaking, 40 goes into 22 zero times with a remainder of 22.
0600 is 6:00 am military time so the time would be 05:40 am or 0540.
22 hours 40 minutes @65 mph
put the long hand on the 3 and put the short hand on the 40 by minutes