A start walking from a place at a uniform speed of 6 kmph in a particular direction. After half an hour, B starts from the same place and walks in the same direction as A at a uniform speed and overtakes A after 1 hour 48 minutes. Find the speed of B. Pick.
A) 4.7 kmph B) 6.6 kmph C) 4 kmph D) 7 kmph E) 5.3 kmph
Distance covered by A in 30 min = 1 Km   B covers extra 1km in 1 hour 48 minutes (9/5 hr)   i.e. Relative speed of 6.6 kmph over A = 1/(9/5) = 5/9   So the speed of 6.6 kmph = Speed of A + 5/9   = 6 + 5/9   = 6.55   Answer 6.6 kmph
<result>B</result>
A start walking from a place at a uniform speed of 6 kmph in a particular direction. After half an hour, B starts from the same place and walks in the same direction as A at a uniform speed and overtakes A after 1 hour 48 minutes. Find the speed of B.