Chemistry the rate of reactions

[taylorswift08]

The reaction A+2B-C takes place in a chemical container. The concentration of substance A is 1.5 mol/l, of substance B 0.75 mol/l.

the constant is 1.7. Find the reaction rate if we double the concentration of substance A

My solution: 45.9 mol/l × s. Is my answer right?

[ChenBeier]

Show your calculation. What about C.
A + 2B - C ? or A + 2B => C