Math, asked by duragpalsingh, 1 year ago

Two persons starting from the same place walk at a rate of 5kmph and 5.5kmph respectively. What time will they take to be 8.5km apart, if they walk in the same direction?

A. 17 hrs

B. 22 hrs

C. 25 hrs

D. 12 hrs

Answers

Answered by Anonymous
1
By verifying using option at 17 hrs
5×17=85 and 5.5×17=93.5
Difference in distance is 8.5km at 17hrs

So option is 17hrs
Answered by abhi178
1
A =====================B

here we can use the concept of relative ,
if both are same direction , and let V1 and V2 are velocity of both then ,
relative velocity of 2ndwith respect to 1st = V2 -V1 =(5.5 -5) = 0.5km/h

now, time = relative distance/relative velocity

because they moves in same place so , relative distance = distance between final and initial point .

so, time = 8.5 km/0.5km/h
= 17 hours

so, option A is correct .
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