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Question
```A man travels from A to B at 4 mph over a certain journey
and returns over the same route to A, at 5 mph. What is his
average speed for the journey?```
Question Submitted By :: Suresh
I also faced this Question!!     Rank Answer Posted By

Re: A man travels from A to B at 4 mph over a certain journey and returns over the same route to A, at 5 mph. What is his average speed for the journey?
# 1
let, x be man travel from A to B and
Y be man travel from B to A then
Average speed is (2XY)/(X+Y)
therefore ans = (2*4*5)/(4+5)
= 4.44mph

 Is This Answer Correct ? 86 Yes 3 No
Suresh

Re: A man travels from A to B at 4 mph over a certain journey and returns over the same route to A, at 5 mph. What is his average speed for the journey?
# 2
x=4m/h
y=5m/h
average speed= x+y/2
4+5/2=4.41m/h

 Is This Answer Correct ? 20 Yes 42 No

Re: A man travels from A to B at 4 mph over a certain journey and returns over the same route to A, at 5 mph. What is his average speed for the journey?
# 3
4.5mph
 Is This Answer Correct ? 14 Yes 19 No
Rao20vaibhav

Re: A man travels from A to B at 4 mph over a certain journey and returns over the same route to A, at 5 mph. What is his average speed for the journey?
# 4
4.444 mph
 Is This Answer Correct ? 15 Yes 6 No
Srini

Re: A man travels from A to B at 4 mph over a certain journey and returns over the same route to A, at 5 mph. What is his average speed for the journey?
# 5
Imagine that the distance from A to B is 20 miles (lowest
common denominator of 4 and 5)

That means on the way there it took him 5 hours (20/4)
On the way back it took him 4 hours (20/5)

So in total it took him 9 hours (5+4) to travel 40 miles (20
miles each way).

So 40/9 = 4.444mph

 Is This Answer Correct ? 24 Yes 1 No
David

Re: A man travels from A to B at 4 mph over a certain journey and returns over the same route to A, at 5 mph. What is his average speed for the journey?
# 6
2*4*5/4+5=40/9=4.44
 Is This Answer Correct ? 8 Yes 0 No
Amrutha

Re: A man travels from A to B at 4 mph over a certain journey and returns over the same route to A, at 5 mph. What is his average speed for the journey?
# 7
avg speed =2xy/x+y

avg speed=2*4*5/(4+5)

=40/9=4.444mph

 Is This Answer Correct ? 11 Yes 0 No
Guest

Re: A man travels from A to B at 4 mph over a certain journey and returns over the same route to A, at 5 mph. What is his average speed for the journey?
# 8
suppose distance of A to B is 30 mile.
then A man travel A to B in 5 hr.and return form B to A in 4 hr. Total time is 9 hr. taken by A man.
(4+5)/2=4.5 mph

 Is This Answer Correct ? 1 Yes 7 No
Ajit

Re: A man travels from A to B at 4 mph over a certain journey and returns over the same route to A, at 5 mph. What is his average speed for the journey?
# 9
Average Speed:
(2xy)/(x+y)
Therefore
=(2*4*5)/(4+5)
=(40)/(9)
=4.4444...

 Is This Answer Correct ? 6 Yes 0 No
Kishore Jangid

Re: A man travels from A to B at 4 mph over a certain journey and returns over the same route to A, at 5 mph. What is his average speed for the journey?
# 10
man A to B = 4mph
man B to A = 5mph

(4/100=4%, 5/100=5%)

average speed =4mph+5mph/200*100
=4.5mph.

 Is This Answer Correct ? 2 Yes 1 No
Bala