Bob drives at an average rate of 50 mph from Berkeley to Los Angeles, a distance of 350 miles. How long does it take him to complete the trip?
(A) 4 hrs
(B) 5 hrs
(C) 7 hrs
(D) 10 hrs
(E) 12 hrs
OA C
Source: Magoosh
Bob drives at an average rate of 50 mph from Berkeley to Los
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- Jay@ManhattanReview
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Distance = 350 milesBTGmoderatorDC wrote:Bob drives at an average rate of 50 mph from Berkeley to Los Angeles, a distance of 350 miles. How long does it take him to complete the trip?
(A) 4 hrs
(B) 5 hrs
(C) 7 hrs
(D) 10 hrs
(E) 12 hrs
OA C
Source: Magoosh
Average speed = 50 mph
Time taken = Distance/Speed
Total time taken = 350/50 = 7 hrs
The correct answer: C
Hope this helps!
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- fskilnik@GMATH
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\[?\,\, = \,\,350\,\,{\text{miles}}\,\,\,\left( {\frac{{1\,\,\,{\text{h}}}}{{50\,\,{\text{miles}}}}\,\,\,\begin{array}{*{20}{c}}BTGmoderatorDC wrote:Bob drives at an average rate of 50 mph from Berkeley to Los Angeles, a distance of 350 miles. How long does it take him to complete the trip?
(A) 4 hrs
(B) 5 hrs
(C) 7 hrs
(D) 10 hrs
(E) 12 hrs
Source: Magoosh
\nearrow \\
\nearrow
\end{array}} \right)\,\,\,\, = 7\,\,{\text{h}}\]
Obs.: arrows indicate licit converter.
Trivial application of UNITS CONTROL, one of the most powerful tools of our course!
This solution follows the notations and rationale taught in the GMATH method.
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As the others have shown, the fast approach is to recognize that: travel time = distance/speed = 350/50 = 7 hoursBTGmoderatorDC wrote:Bob drives at an average rate of 50 mph from Berkeley to Los Angeles, a distance of 350 miles. How long does it take him to complete the trip?
(A) 4 hrs
(B) 5 hrs
(C) 7 hrs
(D) 10 hrs
(E) 12 hrs
OA C
Source: Magoosh
However, we could also (if necessary) solve this by applying some common sense.
Bob's speed is 50 miles per hour.
In other words, for every 1 hour that elapses, Bob travels 50 miles
So, after 1 hour of traveling, Bob has traveled 50 miles
After 2 hours of traveling, Bob has traveled 100 miles
After 3 hours of traveling, Bob has traveled 150 miles
After 4 hours of traveling, Bob has traveled 200 miles
After 5 hours of traveling, Bob has traveled 250 miles
After 6 hours of traveling, Bob has traveled 300 miles
After 7 hours of traveling, Bob has traveled 350 miles
Answer: C
Cheers,
Brent
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BTGmoderatorDC wrote:Bob drives at an average rate of 50 mph from Berkeley to Los Angeles, a distance of 350 miles. How long does it take him to complete the trip?
(A) 4 hrs
(B) 5 hrs
(C) 7 hrs
(D) 10 hrs
(E) 12 hrs
We can use the formula:
Average = total distance/total time
50 = 350/t
50t = 350
t = 7 hours
Answer: C
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