SOLUTION: The average speed of a train running at a speed of 30km/hr during the 1st 100km, at 40km/hr during the 2nd 100km and at 50km/hr during the last 100 is ?

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: The average speed of a train running at a speed of 30km/hr during the 1st 100km, at 40km/hr during the 2nd 100km and at 50km/hr during the last 100 is ?      Log On


   

Question 986214: The average speed of a train running at a speed of 30km/hr during the 1st 100km, at 40km/hr during the 2nd 100km and at 50km/hr during the last 100 is ?
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
RT=D relates rate, time, and distance.
Each distance covered is one term.

Total Time,
100%2F30%2B100%2F40%2B100%2F50
10%2F3%2B10%2F4%2B2
LCD is 3*4
40%2F12%2B30%2F12%2B24%2F12
94%2F12
47%2F6 hours

Total Distance,
100%2B100%2B100=300%2Akm

Average+Speed%2C+300%2F%2847%2F6%29
300%2A6%2F47
highlight%28%2838%261%2F3%29%28km%2Fhour%29%29