SOLUTION: A train covered x km at 45 kmph & then another x km at 36 kmph. Find the average speed of the train in covering the entire journey. A)40 kmph B)38 kmph

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: A train covered x km at 45 kmph & then another x km at 36 kmph. Find the average speed of the train in covering the entire journey. A)40 kmph B)38 kmph      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


   



Question 838691: A train covered x km at 45 kmph & then another x km at 36 kmph. Find the average speed of the train in covering the entire journey.
A)40 kmph
B)38 kmph

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
A train covered x km at 45 kmph & then another x km at 36 kmph. Find the average speed of the train in covering the entire journey.
------------
Avg speed of a round trip, or of 2 equal segments is
2*45*36/(45 + 36) = 3240/81
= 40 km/hr
--------------
Notice the distance is not relevant.