Arrange the following three stars from hottest to coolest.

Star P = type B

Star Q = type K

Star R = type F

P, Q, R

R, Q, P

P, R, Q

Q, R, P

Stars can be classified according to size, distance and temperature. There are different types of stars according to temperature. O is considered the hottest while M is the coolest. The correct answer of the question is P (type B is the 2nd hottest), R (F is 4th in hottest) and Q (type K is second coolest).