Please help me understand

So you have to do this Time Wise. What I mean by this is Kelly ended at 1:30 and she took 3 hours and 30 minutes with this being said, you subtract.

(Subtract 30 from the 3 hours and 30 minutes to make the 1:30 easier to solve)

1:30 - 30 = 1:00

So know we subtract 3 hours Time Wise.

(Go hour by hour of the 3 hours you have left. You subtract 3 times because there are 3 hours )

1:00 - 1:00 = 12:00

12:00 - 1:00 = 11:00

11:00 - 1:00 = 10:00

She started at 10:00.

50 min

step-by-step explanation:

they will be decreasing both their times in half

60 / 2 = 30

40/2 = 20

30 + 20 = 50

168

step-by-step explanation:

first off, we know that he drove 3.5 hours at a rate of 48 mph.

knowing that, we want to see how many miles he drove all-together.

in this case, we can just multiply 48 by 3.5.

48 * 3.5 = 168