A boat goes 8 km upstream in 24 minutes. The speed of stream is 4 km/hr. The speed of boat in still water is: Choose the correct choice
A) 25 km/hr  B) 26 km/hr  C) 22 km/hr  D) 24 km/hr  E) 28 km/hr
rate upstream =8/24*60= 
<gadget id="calculator">8/24*60</gadget>
<output>20</output>
20kmph   speed of stream=4kmph   let speed of boat in still water=xkmph   speed upstream=x-4kmph   x-4=20   x=24kmph   ANSWER:24 km/hr
<result>D</result>
A boat goes 8 km upstream in 24 minutes. The speed of stream is 4 km/hr. The speed of boat in still water is: