The HCF of two numbers is 40. If the product of the two numbers is 52800, their LCM is _________.

We know that,
The product of H.C.F. and L.C.M. of two numbers is equal to the product of those two numbers.
HCF × LCM = Product of the numbers
Now, to find L.C.M,
40 × L.C.M = 52800

$\therefore$LCM= 52800/4

$\therefore$ LC.M= 1320