Two women A and B start their morning run from the same point. A runs 3 km North, then turns West and runs 2 km, then turns to her right and runs 5.5km. B runs 4 km West then turns to her right and runs 8.5 km. Where is B with respect to A now?
A boat cover row 12 km upstream in 4 hours and can cover the same distance downstream in 3 hours. What is the speed (in km/hr) of the boat in still water?