21) Bob ran the first part of a 12 km race at a speed of 8 kmph. He ran the second part of the race at 10 kmph. If his total time for the entire race was 1 74 hours, how far did he run in

the first part of the race?

Item 1 use the polygon tool to draw a rectangle with a length of 4 units and a height of 2 units. one of the sides of the rectangle falls on line ef , and the rectangle has a vertex of e. each segment on the grid represents 1 unit.