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At some point while traveling to a city Mr. Hock increased his speed b

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G
Joined: 25 Dec 2018
Posts: 148
Location: India
GMAT 1: 490 Q47 V13
GPA: 2.86
At some point while traveling to a city Mr. Hock increased his speed b  [#permalink]

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New post 09 Feb 2019, 09:22
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Difficulty:

  25% (medium)

Question Stats:

76% (01:46) correct 24% (02:30) wrong based on 37 sessions

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At some point while traveling to a city Mr. Hock increased his speed by 20%. After traveling for some distance at that speed, he reduced his speed by 15%. After this deduction Mr. Hock's speed was 51 km/hour. What was Mr. Hock's original speed?

A. 42 km/hour
B. 47 km/hour
C. 49 km/hour
D. 50 km/hour
E. 52 km/hour
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Joined: 09 Mar 2018
Posts: 1001
Location: India
Re: At some point while traveling to a city Mr. Hock increased his speed b  [#permalink]

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New post 09 Feb 2019, 09:36
akurathi12 wrote:
At some point while traveling to a city Mr. Hock increased his speed by 20%. After traveling for some distance at that speed, he reduced his speed by 15%. After this deduction Mr. Hock's speed was 51 km/hour. What was Mr. Hock's original speed?

A. 42 km/hour
B. 47 km/hour
C. 49 km/hour
D. 50 km/hour
E. 52 km/hour


Successive % change = 20 - 15 -300/100 = 2%

Now original speed = 51 - 2% 51 = 51-1

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Re: At some point while traveling to a city Mr. Hock increased his speed b  [#permalink]

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New post 11 Feb 2019, 16:42
Increase 20% = 1+.2 =1.2
Decrease 15% = 1-.15= .85

Multiply (1.2)*(.85)= (12)*(80+5)= 960+60=1020 move the decimal =1.020% increase
If the final speed was 51 its original speed must be around 50 km/hr

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Re: At some point while traveling to a city Mr. Hock increased his speed b   [#permalink] 11 Feb 2019, 16:42
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At some point while traveling to a city Mr. Hock increased his speed b

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