Answer:
Both Answers are in the following attachment (a) and (b)
Step-by-step explanation:
It will take them a total of 3.07 hours.
I don't quite understand the ten strategy, or what EXACTLY you're asking. But, what you can do is when you add a one digit number plus a nine, just change the nine to a ten and subtract one. It is very easy. So, 7+10 equals 17, subtract one and you get 16 which is 7+9. It is always one less than anything plus 10.
X= 4/7 because it would be
4/35x=16/245
which would be 28x=16
simplified it would be 4/7