Posted by **cassie** on Tuesday, October 11, 2011 at 7:44am.

1. A car travels 20 kilometers per hour faster than a second car. The first car covers 180 kilometers in the same time the second covers 135 kilometers. What is the average speed of each car?

2. The tens' digit of a two-digit number is one more than its units' digit. If the number is divided by the sum of the digits, the quotient. What is the number?

- Algebra -
**bobpursley**, Tuesday, October 11, 2011 at 8:46am
1. F-20=S

180=F*t and 135=S*t or 180=F*135/S or

S=135/180 F put that into the first equation.

2. Makes no sense to me.

- Algebra -
**Reiny**, Tuesday, October 11, 2011 at 8:50am
speed of 2nd car -- x

speed of 1st car -- x+20

time for 2nd car to go 135 km = 135/x

time for 1st car to go 180 km = 180/(x+20)

but aren't these two the same ?

Continue ....

In the second question, it looks like you did not finish the part where it tells us what the quotient is.

let unit's digit be x

then tens digit is x+1

then the number is 10(x+1) + x = 11x + 10

so (11x+10)/(x+(x+1)) = the quotient

continue

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