6. Water constantly flows from two pipes. From one pipe, 148 liters of water flow out in 1 hour, and from the other, 148 liters of water flow out in 15 minutes. How much water flows out from both pipes in 12 hours and 45 minutes?
First solution.

Since 148 liters of water flow out from the first pipe in 1 hour, it follows that for 15 minutes (a quarter of an hour), 148: 4 = 37 liters of water flow out. 1 POINT

It follows that for 45 minutes, 37 * 3 = 111 liters of water flow out. 1 POINT

For 12 hours, 12 * 148 = 1776 liters of water flow out from the first pipe. 1 POINT

Therefore, for 12 hours and 45 minutes, 1776 + 111 = 1887 liters of water flow out from the first pipe. 1 POINT

From the second pipe, 148 liters of water flow out in 15 minutes, which means that for 45 minutes, 3 * 148 = 444 liters of water flow out, and for 1 hour, 4 * 148 = 592 liters of water flow out. 2 POINTS

For 12 hours, 12 * 592 = 7104 liters of water flow out from the second pipe. 1 POINT

Therefore, for 12 hours and 45 minutes, 7104 + 444 = 7548 liters of water flow out from the second pipe. 1 POINT

Therefore, for 12 hours and 45 minutes, from both pipes, 1887 + 7548 = 9435 liters of water flow out. 2 POINTS

.TOTAL 10 POINTS

Note: The last point is awarded for the written answer.