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Two boys starts from the same place walking at the rate of 5 kmph and 5.5 kmph respectively in the same direction. What time will they take to be 8.5 km apart?
- a)17 hr
- b)14 hr
- c)12 hr
- d)19 hr
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Two boys starts from the same place walking at the rate of 5 kmph and ...
In this type of questions we need to get the relative speed between them,
The relative speed of the boys = 5.5kmph – 5kmph
= 0.5 kmph
Distance between them is 8.5 km
Time = Distance/Speed
Time= 8.5km / 0.5 kmph = 17 hrs
Most Upvoted Answer
Two boys starts from the same place walking at the rate of 5 kmph and ...
You have to first find relative speed by simply substracting the both.
Relative speed = Speed of B - Speed of A
= 5.5 kmph - 5 kmph
= 0.5 kmph
Now, put it in equation:-
Time = Distance/ speed
t= d/s = 8.5/0.5= 17 hours
However, the correct answer is (a) 17 hours
Relative speed = Speed of B - Speed of A
= 5.5 kmph - 5 kmph
= 0.5 kmph
Now, put it in equation:-
Time = Distance/ speed
t= d/s = 8.5/0.5= 17 hours
However, the correct answer is (a) 17 hours
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Community Answer
Two boys starts from the same place walking at the rate of 5 kmph and ...
Let distance travel by A in particular time be X. After same time duration the distance travel by B will be X+8.5.
As we know
time= distance/speed
Also Time taken by A = Time taken by B
SO, X/5 = (X+8.5)/5.5
=> 5.5X = 5X + 42.5
=> 0.5X= 42.5
=> X= 85km
So Time = X/5 hr
=> Time = 17 hr Ans.
As we know
time= distance/speed
Also Time taken by A = Time taken by B
SO, X/5 = (X+8.5)/5.5
=> 5.5X = 5X + 42.5
=> 0.5X= 42.5
=> X= 85km
So Time = X/5 hr
=> Time = 17 hr Ans.
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Two boys starts from the same place walking at the rate of 5 kmph and 5.5 kmph respectively in the same direction. What time will they take to be 8.5 km apart?a)17 hr b)14 hrc)12 hr d) 19 hrCorrect answer is option 'A'. Can you explain this answer?
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