A trained covered x km at 30 kmph and another 2x km at 20 kmph. Find the average speed of the train in covering the entire 3x km. Choose the correct choice from the following
A) 22.5  B) 99  C) 24  D) 66  E) 887
Total time taken = x/30 + 2x/20 hours   = 2x/15 hours   22.5verage speed = 3x/(2x/15) = 22.5 kmph   22.5nswer: 22.53 /(2 /15)= 
<gadget id="calculator">3 /(2 /15)</gadget>
<output>45/2 = around 22.5</output>
22.5 kmph   22.5nswer: 22.5
<result>A</result>
A trained covered x km at 30 kmph and another 2x km at 20 kmph. Find the average speed of the train in covering the entire 3x km.