A boat running downstream covers a distance of 22 km in 4 hours while for covering the same distance upstream, it takes 5 hours. What is the speed of the boat in still water?  Choose the correct choice from the following options:
A) 1.85
B) 3.75
C) 4.95
D) 2.45
E) 5.21
Explanation:   Speed downstream =22/4= 
<gadget id="calculator">22/4</gadget>
<output>11/2 = around 5.5</output>
5.5 kmph   Speed upstream=22/5= 
<gadget id="calculator">22/5</gadget>
<output>22/5 = around 4.4</output>
4.4 kmph   Speed of the boat in still water=5.5+4.4/2=4.95 kmph   Answer:4.95
<result>C</result>
A boat running downstream covers a distance of 22 km in 4 hours while for covering the same distance upstream, it takes 5 hours. What is the speed of the boat in still water?