SOLUTION: A train when moves at an average speed of 40 kmph reaches it's destination on time. if the average speed becomes 35 kmph, then it reaches the destination 15 minutes late. Find the
Algebra ->
Customizable Word Problem Solvers
-> Travel
-> SOLUTION: A train when moves at an average speed of 40 kmph reaches it's destination on time. if the average speed becomes 35 kmph, then it reaches the destination 15 minutes late. Find the
Log On
Question 522755: A train when moves at an average speed of 40 kmph reaches it's destination on time. if the average speed becomes 35 kmph, then it reaches the destination 15 minutes late. Find the length of the journey?
You can put this solution on YOUR website! A train when moves at an average speed of 40 kmph reaches it's destination on time.
if the average speed becomes 35 kmph, then it reaches the destination 15 minutes late.
Find the length of the journey?
:
Let d = the length of the journey
:
Change 15 min to .25 hr
:
Write a time equation; time = dist/speed
:
Slow time - required time = .25 hrs - = .25
multiply by 280,
280* - 280* = 280(.25)
cancel the denominators:
8d - 7d = 70
d = 70 km is the length of the journey
:
:
Check this, find the time at each speed
70/35 = 2.00 hr
70/40 = 1.75 hr
----------------
time dif: .25 hrs which is 15 min
