SOLUTION: A man normally takes 5 hours to travel at a certain speed from A city to B .one day, he increases his speed by 4 km/Hrs and finds that the journey from A to B takes half an hour

Question 973026: A man normally takes 5 hours to travel at a certain speed from A city to B .one day, he increases his speed by 4 km/Hrs and finds that the journey from A to B takes half an hour less than the normal time. Find his normal speed.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = his normal speed in km/hr
Let = distance from A to B in km
-----------------
Traveling at normal speed:
(1)
Traveling at faster speed:
(2)
--------------------------
(2)
(2)
Substitute (1) into (2)
(2)
(2)
(2)
His normal speed is 36 km/hr
-----------------------------
check:
(1)
(1)
(1) km
and
(2)
(2)
(2) km
OK

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