John entered a cross-country ski race. The first part of the race was 15 km long, and he completed it in 1 hour. The second part was 18 km long, and he completed this part in an hour and a half. What was John's average speed for the whole race? A. 28 kilometers per hour B. 27 kilometers per hour C. 13.6 kilometers per hour D. 13.2 kilometers per hour

option D is the correct answer.

Step-by-step explanation:

The first part of the race was 15 km long, and he completed it in 1 hour.

Speed = distance/time

Therefore, John's speed in the first part of the race would be

15/1 = 15km/hr

The second part was 18 km long, and he completed this part in an hour and a half. This means that his speed in the second part of the race is

18/1.5 = 12km/hr

Total distance/total time

Total distance for both parts of the race is 15 + 18 = 33km

Total time for the race is 1 + 1.5 = 2.5 hours

John's average speed for the whole race would be

33/2.5 = 13.2 kilometers per hour

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540

the multiples of 15 are 15, 30,45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195,   210, 225, 240, 255, 270, 285, 300, 315, 330, 345, 360, 375,   390, 405, 420, 435, 450, 465, 480, 495, 510, 525, 540, 555, 570, 585, 600, 615, 630, 645, 660, 675, 690, 705, 720, and 735.

the factors of 15 are 1, 3, 5, and 15.

hope that , fam!

-une, your fren : )