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09 Sep 2016, 17:17
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E
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When a person went to travelling, she estimated the traveled distance and the speed. Then, she calculated the actual time. Is the difference between estimated and actual time smaller than 10minutes?
1) The difference between the estimated and actual distance is within 50miles
2) The difference between the estimated and actual velocity is within 50miles/1minutes
*An answer will be posted in 2 days
1) The difference between the estimated and actual distance is within 50miles
2) The difference between the estimated and actual velocity is within 50miles/1minutes
*An answer will be posted in 2 days
10 Sep 2016, 05:51
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MathRevolution
When a person went to travelling, she estimated the traveled distance and the speed. Then, she calculated the actual time. Is the difference between estimated and actual time smaller than 10minutes?
1) The difference between the estimated and actual distance is within 50miles
2) The difference between the estimated and actual velocity is within 50miles/1minutes
*An answer will be posted in 2 days
1) The difference between the estimated and actual distance is within 50miles
2) The difference between the estimated and actual velocity is within 50miles/1minutes
*An answer will be posted in 2 days
Answer E.
We are given,
|Actual(D) - Estimated(D) |<= 50
|Actual(V) - Estimated(V) |<=50
We have to find out |Actual(t)-Estimated(t)|
Now, Actual(t)= Actual(D)/Actual(V)
and Estimated(t)= Estimated(D)/Estimated(V)
or |Actual(t)-Estimated(t)| = [Actual(D)/Actual(V)] - [ Estimated(D)/Estimated(V)]
Note that we are not given the individual values of either D or V.
So, we cannot find the difference between the two ratios. Hence E.
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10 Sep 2016, 07:20
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MathRevolution
When a person went to travelling, she estimated the traveled distance and the speed. Then, she calculated the actual time. Is the difference between estimated and actual time smaller than 10minutes?
1) The difference between the estimated and actual distance is within 50miles
2) The difference between the estimated and actual velocity is within 50miles/1minutes
*An answer will be posted in 2 days
1) The difference between the estimated and actual distance is within 50miles
2) The difference between the estimated and actual velocity is within 50miles/1minutes
*An answer will be posted in 2 days
we want to confirm if,
Te - Ta < 10 => De/Se - Da/Sa < 10
1 gives us De - Da <= 50 ...not sufficient
2 gives us Se - Sa <= 50 ... not sufficent
combining above equations we are unable to come up with required ratios
Answer should be E
