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Sathvika travels p% of the distance between Adyar and Annanagar at 60

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Sathvika travels p% of the distance between Adyar and Annanagar at 60  [#permalink]

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New post 17 Sep 2018, 02:01
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

69% (02:37) correct 31% (02:30) wrong based on 64 sessions

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Re: Sathvika travels p% of the distance between Adyar and Annanagar at 60  [#permalink]

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New post 17 Sep 2018, 03:11
1
Bunuel wrote:
Sathvika travels p% of the distance between Adyar and Annanagar at 60 miles/hr and the remaining at 40 miles/hr. In terms of p, what was Sathvika's average speed in miles/hr for the entire trip?


(A) (100-p)/2

(B) 50p

(C) (100+p)/(5p)

(D) 600p/(100-p)

(E) 12000/(300-p)


Let's assume an easy number for p = 50.

The question becomes Sathvika travels half the distance at 60 miles/hr and the other half at 40 miles/hr.
Average speed can be calculated by using formula = 2*a*b/(a + b) = 2*40*60/100 = 48

Now, we need to check which of the answer options match this average speed

(A) (100-p)/2 = 50/2 = 25
(B) 50p (Too large)
(C) (100+p)/(5p) = 150/250 (Too small)
(D) 600p/(100-p) = 600*50/50 (Too large)

(E) 12000/(300-p) = 12000/250 = 48 (Exact match)

Therefore, \(\frac{12000}{300-p}\) - (Option E) is the average speed of Sathvika's trip in terms of p
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Re: Sathvika travels p% of the distance between Adyar and Annanagar at 60   [#permalink] 17 Sep 2018, 03:11
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Sathvika travels p% of the distance between Adyar and Annanagar at 60

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