Answer :

10 1/2 is the answer.

Steps:
Change the fraction to improper fractions.
Multiply
Reduce
Change to proper fraction

Steps(Another Way):
Change the fraction to improper fractions.
Reduce by crossing it(5 and 15 reduced to 1 and 3; 4 and 14 reduced to 2 and 7.)
Change answer to proper fraction.
210 would be the answer mutiply the botom of the fraction with the number and add the top of the fraction do that to both then add them together it would look like this
3times 4 +3=15 and 2 times 5+4=14  15 times 14= 210