Question

A man speed with current is 15km/hr and the speed of current is 2.5km/hr the man's speed again current is ???

Answer 1

hi

friend                                  

here is your answer

                                                                                                                           

                                                  [step 1]

A Man speed with the current (Downstream speed) = speed of man (x) + speed of current

15km/hr = x + 2.5km/hr

x = (15-2.5)km/hr

x = 12.5km/hr

                                                      [step 2]

Man' speed against the current (Upstream speed) = speed of man-speed of current

Upstream speed = 12.5km/hr - 2.5km/hr

Upstream speed = 10km/hr

 so  your  correct  answer  is  10km/hr

Answer 2

Let current speed be x

Speed when travelling with current

= man's speed+x=15

>>> man's speed 15-x

Speed when travelling against current

= man speed- x = 15-2x

= 15-2.5-2.5

= 10km/hr

@skb