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25 Nov 2018, 22:09
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
74% (01:29) correct
26%
(01:43)
wrong
based on 107
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Rajesh and Pihu started walking from the same point in opposite directions on a circular racing track of circumference 300 yards. When will the two meet for the first time on the track, if they keep walking continuously at their respective speeds?
(1) Ratio of speeds of Rajesh and Pihu is 3:2.
(2) Pihu can complete one round of the track in 30 minutes, if she walks continuously at her speed.
(1) Ratio of speeds of Rajesh and Pihu is 3:2.
(2) Pihu can complete one round of the track in 30 minutes, if she walks continuously at her speed.
25 Nov 2018, 22:45
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Statement 1 is insufficient since only the ratio of their speed is given.
From statement 2:
Speed pihu is 300/30 = 10 yards/min.
Insufficient.
Combining both:
The ratio of speed of R:P = 3:2
Speed of R becomes 15 yards/min
Both will meet after 300/15+10 = 12 min.
C is the answer.
From statement 2:
Speed pihu is 300/30 = 10 yards/min.
Insufficient.
Combining both:
The ratio of speed of R:P = 3:2
Speed of R becomes 15 yards/min
Both will meet after 300/15+10 = 12 min.
C is the answer.
Its a good trap Question , if you don't use the all the details given in the question.
Option C is the Correct the Choice
Given, Rajesh and Pihu are travelling in opposite direction.
Circumference(total Distance) = 300
Asked , when Rajesh and Pihu will meet ?
Statement 1 = Ratio of their speed 3:2
Now as we know time travel to reach the first meeting point will be same for both of them hence we have
\(\frac{D1}{S1}\) = \(\frac{D2}{S2}\) ........(I)
Where D1 is the distance travel by rajesh and S1 is the speed of rajesh and D2 is the distance travel by Pihu and S2 is the speed of Pihu.
Also D1 + D2 = 300 as we know both are travelling in opposite direction and total distance/circumference is 300 .......(II)
From the first equation we have
\(\frac{D1}{D2}\) =\(\frac{S1}{S2}\)
= \(\frac{D1}{D2}\) =\(\frac{3}{2}\) .......(III)
2 Equation 2 variables for D1, D2 and hence using equation (II) and (III) we can find the value of D1 and D2 but we dont know the values of S1 or S2. hence we cannot determine the value of time.
Statement 1 is not sufficient
Statement 2 = Only speed of Pihu can be calculated and no information is given about the Speed of rajesh or the distance traveled by any one of them or both.
Hence Insufficient
Combining both , we can calculate the time to reach the meeting point for Pihu and this time will going to be same for rajesh also.
hence Correct Choice is Option C
please hit the Kudo Button
Option C is the Correct the Choice
Given, Rajesh and Pihu are travelling in opposite direction.
Circumference(total Distance) = 300
Asked , when Rajesh and Pihu will meet ?
Statement 1 = Ratio of their speed 3:2
Now as we know time travel to reach the first meeting point will be same for both of them hence we have
\(\frac{D1}{S1}\) = \(\frac{D2}{S2}\) ........(I)
Where D1 is the distance travel by rajesh and S1 is the speed of rajesh and D2 is the distance travel by Pihu and S2 is the speed of Pihu.
Also D1 + D2 = 300 as we know both are travelling in opposite direction and total distance/circumference is 300 .......(II)
From the first equation we have
\(\frac{D1}{D2}\) =\(\frac{S1}{S2}\)
= \(\frac{D1}{D2}\) =\(\frac{3}{2}\) .......(III)
2 Equation 2 variables for D1, D2 and hence using equation (II) and (III) we can find the value of D1 and D2 but we dont know the values of S1 or S2. hence we cannot determine the value of time.
Statement 1 is not sufficient
Statement 2 = Only speed of Pihu can be calculated and no information is given about the Speed of rajesh or the distance traveled by any one of them or both.
Hence Insufficient
Combining both , we can calculate the time to reach the meeting point for Pihu and this time will going to be same for rajesh also.
hence Correct Choice is Option C
please hit the Kudo Button
