When Two Resistors Are Connected in Series, the Equivalent Resistance

When two resistors are connected in series, the equivalent resistance is R_s = 10 Ω. When they are connected in parallel, the equivalent resistance is R_p = 2.4 Ω. What are the values of the two resistances?

A) 4.0 Ω and 6.0 Ω
B) 5.0 Ω for both
C) 1.0 Ω and 1.4 Ω
D) 1.2 Ω for both
E) 2.5 Ω and 7.5 Ω