Answer:
Step-by-step explanation:
firstly i need to actually understand the answer
The speed of the motorboat travelling up stream will be 13mph, therefore it will take 20/13 hours to travel 20 miles upstream. This is about 1 and a half hours. The speed of the motorboat travelling downstream will be 17mph, therefore it will take 20/17 hours to travel 20 miles downstream. This is about 1 hour 10 minutes.
These. 2 fractions r not equivalent. to see it, just simplify them. as 72 could be divided by 9, we can change it to 7.875/9, just divide both by 8, because u know, 9x8 = 72. as you can see, 7.875/9 IS NOT 6/9. so they're not equivalent.