Find avrg speed if a man travels at speed of 16km/hr up and 30km/hr dawn at an altitude of 200m. Choose the correct choice:	A) 22.8	B) 21.8	C) 20.8	D) 28.8	E) 29.8

Rationale: "avg speed = 2 * x * y / ( x + y ) = 2 * 16 * 30 / ( 16 + 30 ) = 20.8 answer : c"
Answer: C