Any math geniuses? How to multiply these?

1, I don’t know how to multiply "4 grams times 9 volts" can you?

2, how about 4 grams times 3 miles per hour? Or impossible?

Updates
1 y
Hurray, without bias everyone can see einstein equation is fake! Energy is "mass times speed" is impossible. But if einstein said it you *beleive him!
His genius was making equations that convinced physicists, but anyone can see he was not correct!
Any math geniuses? How to multiply these?
Post Opinion