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 twodigit 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. F20=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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