Ttakes phillip 7 hours to proof a chapter of hawkes learning systems' intermediate algebra book and it takes kim 3 hours. how long would it take them working together? (round your answer to two decimal places.)

2.1 hrs

Step-by-step explanation:

In 1 hr, Phillip would have proofed 1/7 of the chapter. In 1 hr, Kim would have proofed 1/3 of the chapter. So, together in 1 hr, they would have proofed 10/21 of the chapter. So, it would take 21/10 or 2.1 hrs to proof the whole chapter together.

(All in km)

Mercury 57,909,000

Venus 108,208,930

Earth 149,600,000

Mars 227,940,000

Jupiter 778,547,200

Saturn 1,433,449,370