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# Tory drives eastwards 50 miles at an average speed of 40 miles per

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Senior Manager
Joined: 25 Dec 2018
Posts: 488
Location: India
Concentration: General Management, Finance
GMAT Date: 02-18-2019
GPA: 3.4
WE: Engineering (Consulting)
Tory drives eastwards 50 miles at an average speed of 40 miles per  [#permalink]

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30 Mar 2019, 06:02
00:00

Difficulty:

35% (medium)

Question Stats:

65% (01:10) correct 35% (01:06) wrong based on 20 sessions

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Tory drives eastwards 50 miles at an average speed of 40 miles per hour and returns along the same path at an average speed of 60 miles per hours. What is his average speed for the complete journey?

A. 24 mph
B. 45 mph
C. 48 mph
D. 50 mph
E. 55 mph
GMAT Club Legend
Joined: 12 Sep 2015
Posts: 4016
Re: Tory drives eastwards 50 miles at an average speed of 40 miles per  [#permalink]

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30 Mar 2019, 06:44
Top Contributor
mangamma wrote:
Tory drives eastwards 50 miles at an average speed of 40 miles per hour and returns along the same path at an average speed of 60 miles per hours. What is his average speed for the complete journey?

A. 24 mph
B. 45 mph
C. 48 mph
D. 50 mph
E. 55 mph

Average speed = (total distance traveled)/(total travel time)

TOTAL distance traveled = 50 miles + 50 miles = 100 miles

Time = distance/speed
So, time spent driving 40 mph = 50/40 = 5/4 hours
And time spent driving 60 mph = 50/60 = 5/6 hours
TOTAL driving time = 5/4 + 5/6 = 15/12 + 10/12 = 25/12 hours

Average speed = (100)/(25/12)
= (100)(12/25)
= 1200/25
= 48

Cheers,
Brent
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Re: Tory drives eastwards 50 miles at an average speed of 40 miles per  [#permalink]

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30 Mar 2019, 09:32
mangamma wrote:
Tory drives eastwards 50 miles at an average speed of 40 miles per hour and returns along the same path at an average speed of 60 miles per hours. What is his average speed for the complete journey?

A. 24 mph
B. 45 mph
C. 48 mph
D. 50 mph
E. 55 mph

2*60*40/100
IMO C
48
Re: Tory drives eastwards 50 miles at an average speed of 40 miles per   [#permalink] 30 Mar 2019, 09:32
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