AbeNeedsAnswers wrote: ↑Sat May 16, 2020 7:13 pm
A salesperson who had been driving at a speed of 100 kilometers per hour slowed down to a speed of 47 kilometers per hour. Approximately how many miles per hour was the speed reduced? (1 kilometer ~ 0.625 mile)
A. 29
B. 33
C. 53
D. 63
E. 75
B
A salesperson who had been driving at a speed of 100 kilometers per hour slowed down to a speed of 47 kilometers per hour.
Reduction in speed = 100 - 47 =
53 kilometers per hour
We can use
equivalent ratios to convert
53 kilometers per hour to miles per hour.
We are told that 1 kilometer ≈ 0.625 miles
So, if we use the ratio
kilometers/
miles, we can express the relationship as:
kilometers/
miles =
1/
0.625
Let
x = the desired speed (in mph)
We can now write:
1/
0.625 =
53/
x
Cross multiply to get: 1x = (53)(0.625) ≈ 33 mph
Answer: B
Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
