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A car travels 60 kilometers in one hour before a piston breaks, then

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A car travels 60 kilometers in one hour before a piston breaks, then [#permalink] New post   12 Jan 2019, 08:46
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A car travels 60 kilometers in one hour before a piston breaks, then travels at 30 kilometers per hour for the remaining 60 kilometers to its destination. What is its average speed in kilometers per hour for the entire trip?

A. 20
B. 40
C. 45
D. 50
E. 60

Source: Kaplan GMAT Math Workbook - Sixth Edition
Page# 297
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B
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Re: A car travels 60 kilometers in one hour before a piston breaks, then [#permalink] New post   12 Jan 2019, 09:12
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Total Distance : 1*60 +60=120
Total time taken = 1+ 60/30= 1+2=3
Hence average speed for the trip = 120/3= 40 kmph
Hence Ans B.
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Re: A car travels 60 kilometers in one hour before a piston breaks, then [#permalink] New post   21 Jan 2019, 18:38
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SajjadAhmad wrote:
A car travels 60 kilometers in one hour before a piston breaks, then travels at 30 kilometers per hour for the remaining 60 kilometers to its destination. What is its average speed in kilometers per hour for the entire trip?

A. 20
B. 40
C. 45
D. 50
E. 60


We can use the formula: average = total distance/total time.

Time 1 = 1 hour and time 2 = 60/30 = 2 hours. Total time is 3 hours.

Distance 1 = 60 miles and distance 2 = 60 miles. Total distance is 120 miles, so we have:

average speed = 120/3 = 40 mph

Answer: B
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Re: A car travels 60 kilometers in one hour before a piston breaks, then [#permalink] New post   15 Jan 2019, 17:25
SajjadAhmad wrote:
A car travels 60 kilometers in one hour before a piston breaks, then travels at 30 kilometers per hour for the remaining 60 kilometers to its destination. What is its average speed in kilometers per hour for the entire trip?

A. 20
B. 40
C. 45
D. 50
E. 60

Source: Kaplan GMAT Math Workbook - Sixth Edition
Page# 297


Average Speed = Total Distance/Total Time = (60+60)/(1+2) = 120/3 = 40
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Re: A car travels 60 kilometers in one hour before a piston breaks, then [#permalink] New post   27 Feb 2019, 07:17
So.
Speed 1= distance/time =60/1=60
Speed 2 = given as 30

Avgspeed= 2s1s2/s1+s2
= 2*30*60/30+60=40
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Re: A car travels 60 kilometers in one hour before a piston breaks, then [#permalink]
27 Feb 2019, 07:17
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