A man's speed with the current is 21 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is?
Pick one.
A) 10	B) 20	C) 16	D) 30	E) 40
Man's speed with the current = 21 km/hr   =&gt; speed of the man + speed of the current = 21 km/hr   speed of the current is 2.5 km/hr   Hence, speed of the man = 21 - 2.5= 
<gadget id="calculator">21 - 2.5</gadget>
<output>18.5</output>
18.5 km/hr   man's speed against the current= speed of the man - speed of the current   = 18.5 - 2.5= 
<gadget id="calculator">18.5 - 2.5</gadget>
<output>16</output>
16 km/hr   Answer is 16.
<result>C</result>
A man's speed with the current is 21 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is?