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May 16th, 2015, 07:07 PM   #1
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Time and Distance

I want to know the solution bcz my answer is 3km per hour
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May 16th, 2015, 07:36 PM   #2
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Quote:
Originally Posted by gauravkoolyadav View Post
my answer is 3km per hour


I think even so .
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May 16th, 2015, 07:45 PM   #3
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After 6 hours, Anita has travelled 24 km. 42 - 24 = 18 and 18/6 = 3, so Romita travelled at 3 km per hour.
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May 17th, 2015, 06:26 AM   #4
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This is confused by a typographical error- "Romita starts from S to R also with same uniform speed". Grammatically, that means that Romita must have the same speed as Anita, 4 km/h. What is clearly intended is "some uniform speed" (and "constant speed" would be better than "uniform speed").

Taking Romilda's speed to be "r" km/hr, her speed relative to Anita is r+ 4. Working with "relative" speed, we can treat Anita as if she were standing still. Romilda will cover the 42 km initially between them in 42/(r + 4) hours. We are told that she covered it in 6 hours. Solve 42/(r + 4) = 6 for r.

Last edited by skipjack; May 17th, 2015 at 06:38 AM.
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May 18th, 2015, 03:05 AM   #5
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Yes of cource 3 is the correct answer.This is the explanation if time taken where they met is 6 hours this means the relative velocity between them must be 42/6 that is 7 hours.As they are travelling in opposite direction so if one speed is 4 other's should be 7-4 that is 3 km /hour. This means you are absolutely right. Well done.
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