You drive to the store at 20 kmph and return by the same route at 30 kmph. Discounting the time spent at the store, what was your average speed ?
Choose the correct choice from the following:
A) 14 kmph	B) 24 kmph	C) 74 kmph	D) 64 kmph	E) 44 kmph
Explanation:   Average speed=total distance/total time   Let distance to store be K   then, total time =(K/20)+(K/30)=K/12   and, total time =(2K)   so average speed= 2K / (K/12) = 24kmph.   Answer: 24 kmph
<result>B</result>
You drive to the store at 20 kmph and return by the same route at 30 kmph. Discounting the time spent at the store, what was your average speed ?