Question

Ramdass can row downstream 18 km in 3 hrs and upstream 9 km in 3 hrs.find his speed of rowing in still water and the speed of current.

Answer 1

Distance covered Downstream = 18 km
Time                                          = 3 hrs
Speed Downstream                  = 18/3 km/hr
                                                  = 6 km/hr

Distance covered Uptream = 9 km
Time                                          = 3 hrs
Speed Upstream                  = 9/3 km/hr
                                                  = 3 km/hr

Speed of Current = (6-3)/2
                            = 1.5 km/hr

Speed of Boat in Still Water = 6-1.5 km/hr or 3+1.5 km/hr
                                           = 4.5 km/hr