Question

A man's speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is:

Answer 1

let speed of man =x and speed of current be =y

x+y=15
x+2.5=15
x=12.5

now
x-y=
12.5-2.5= 10km/h

Answer 2

Answer:

The man's speed against the current is 10 km/hr.

Step-by-step explanation:

Given : A man's speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr.

To find : The man's speed against the current ?

Solution :

A man's speed with the current is 15 km/hr.

The speed of the current is 2.5 km/hr.

Let the speed of the man be 'x' km/hr.

Let the man's speed against the current be 'y' km/hr.

The downstream speed is

Man speed with the current = Speed of man+Speed of current

i.e. $15=x+2.5$

$x=15-2.5$

$x=12.5$

The speed of the man be 12.5 km/hr.

The upstream speed is

Man speed against the current = Speed of man-Speed of current

i.e. $y=12.5-2.5$

$y=10$

The man's speed against the current is 10 km/hr.