In eleven hours C walks 12 5 km less than what D does in twelve hrs and in five hrs D walks 3 25 km ...........

Quantitative Aptitude ( CCS) Time & distance

In eleven hours C walks 12.5 km less than what D does in twelve hrs; and in five hrs D walks 3.25 km less than what C does in seven hrs. How many km does each walk per hour ?

4 and 4.5

3.25 and 4

3.5 and 4.25

4.5 and 3.5

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Explanation:

Solution:
Let the speed of C be x km/hr and D be y km/hr.
Then 12y-11x=12.5—–1
And 7x-5y=3.25——2
By solving 1 and 2
We get x=3.5km/hr and y=4.25km/hr.