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A man covers a distance of 1200 km in 70 days resting 9 hours a day, if he rests 10 hours a day and walks with speed 1½ times of the previous in how many days will he cover 840 km ?

Correct Answer: 35 days

Explanation:

Distance d = 1200km
let S be the speed


he walks 15 hours a day(i.e 24 - 9)
so totally he walks for 70 x 15 = 1050hrs.


S = 1200/1050 => 120/105 = 24/21 => 8/7kmph



given 1 1/2 of previous speed
so 3/2 * 8/7= 24/14 = 12/7


New speed = 12/7kmph


Now he rests 10 hrs a day that means he walks 14 hrs a day.


time = 840 x 7 /12 => 490 hrs
=> 490/14 = 35 days


So he will take 35 days to cover 840 km.


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