Question 1090051
<pre>
If A varies inversely and B, then the rule is:

{{{matrix(1,3,
(matrix(1,5,A,in,the,first,case))(matrix(1,5,B,in,the,first,case)),
""="",
(matrix(1,5,A,in,the,second,case))(matrix(1,5,B,in,the,second,case)))}}}

[Note for other problems, you might have: In other problems, it'll 
be "directly" instead of "inversely", and in those you'll change
the multiplications above to divisions.]

{{{matrix(1,3,
(matrix(1,5,TIME,in,the,first,case))(matrix(1,5,SPEED,in,the,first,case)),
""="",
(matrix(1,5,TIME,in,the,second,case))(matrix(1,5,SPEED,in,the,second,case)))}}}

{{{matrix(1,3,
(matrix(1,2,2,hours))(matrix(1,2,30,mph)),
""="",
(matrix(1,2,H,hours))(matrix(1,2,50,mph)))}}}

{{{matrix(1,3,
2*30,
""="",
H*50)}}}

{{{matrix(1,3,
60,
""="",
50H)}}}

{{{matrix(1,3,
60/50,
""="",
H)}}}

{{{matrix(1,3,
6/5,
""="",
H)}}}

{{{6/5}}} of an hour is {{{1&1/5}}} hours or 1 hour and 12 minutes.

Edwin</pre>