Two people enter a race in whick you run to a point and
back. Person A runs 20 mph to and from the point. Person B
runs to the point going 10 mph and 30 mph going back.
Who came in first?
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Answer / guest
Person A came in first.
Let's assume that the distance between start and the point
is D miles.
Total time taken by Person A to finish
= (D/20) + (D/20)
= D/10
= 0.1D
Total time taken by Person B to finish
= (D/10) + (D/30)
= 2D/15
= 0.1333D
Thus, Person A is the Winner.
Alternatively (if you don't like mathematics ;)), analyse
the situation as follow:
Note that initially speed of Person A (20 mph) was twice the
speed of Person B (10 mph). Hence, when Person A (20 mph
forward) reached the point, Person B (10 mph forward) was
halfway. When Person A (20 mph back) finished, Person B
(still 10 mph forward) reached the point.
Thus, Person A wins the race and by that time Person B
covers only half the distance, no matter how far the point is!!!
| Is This Answer Correct ? | 21 Yes | 0 No |
Answer / dilip tripathi
Let the distance be x
First Person : Total time = x/20 + x/20
= x/10
= .1x
Second Person : Total time = x/10 + x/30
= x/30
= .133x
Since Time taken by Second person is more than first one
So first will reach earlier
| Is This Answer Correct ? | 8 Yes | 1 No |
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Two people enter a race in whick you run to a point and back. Person A runs 20 mph to and from the point. Person B runs to the point going 10 mph and 30 mph going back. Who came in first?
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