At 12.00 hours, J starts to walk from his house at 6 kmph. At 13.30, P follows him from J's house on his bicycle at 8 kmph. When will J be 3 km behind P?  Pick.
A) 19.39
B) 19.3
C) 19.32
D) 19.33
E) 19.36
By the time P starts J is 1.5 hr x 6 = 9 km away from his house.   J is 3 km behind when P is 3 km ahead of him. ie., P has to cover 12 km. So he takes  12 / (8 - 6)= 
<gadget id="calculator"> 12 / (8 - 6)</gadget>
<output>6</output>
6 hrs after 13.30. So the required time is 19.30Hrs   Answer:19.3
<result>B</result>
At 12.00 hours, J starts to walk from his house at 6 kmph. At 13.30, P follows him from J's house on his bicycle at 8 kmph. When will J be 3 km behind P?