John walking at 4 Kmph reaches his office 8 minutes late. If he walks at 6 Kmph, he reaches there 12 minutes earlier. How far is the office from his house? Choose the correct choice from the following answers.
A) 3 2/5 Km
B) 3 1/5 Km
C) 4 Km
D) 5 1/5 Km
E) None
Formula = S1*S2/S2-S1 * T1+T2/60   = 4*6/2 * 20/6   = 24/2 * 20/60   = 20/5= 
<gadget id="calculator">20/5</gadget>
<output>4</output>
4 Km   4 Km
<result>C</result>
John walking at 4 Kmph reaches his office 8 minutes late. If he walks at 6 Kmph, he reaches there 12 minutes earlier. How far is the office from his house?