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Bunuel
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Bunuel
A Super-Jet airplane is flying at an average speed of 500 miles per hour. The average speed of a Turbo- Prop airplane is 15% lower than that of a Super-Jet. How long will it take a Turbo-Prop airplane to fly 950 miles?

A. 2 hours.
B. 1 hour and 30 minutes.
C. 3 hours and 15 minutes.
D. 2 hours and 24 minutes.
E. 4 hours.

CONCEPT: Speed is Inversely Proportional to Time take to cover the distance so S1/S2 = T2/T1 but this property can be applied only in case the constant distance case so would be difficult to apply here

Super-Jet airplane Speed = 500
Turbo-Prep airplane Speed = 0.85*500 = 425

Distance = 950 Miles

Time = Distance/speed = 950/425 = 2 hours 14 mins

Best Answer: Option D
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Answer is 2 hours and a little more than 14 mins. The closest being "D".
And I am still not getting guys how come 950/425 is yielding you 2 HOURS :O . I always was taught 425 * 2 = 850.
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Bunuel
A Super-Jet airplane is flying at an average speed of 500 miles per hour. The average speed of a Turbo- Prop airplane is 15% lower than that of a Super-Jet. How long will it take a Turbo-Prop airplane to fly 950 miles?

A. 2 hours.
B. 1 hour and 30 minutes.
C. 3 hours and 15 minutes.
D. 2 hours and 24 minutes.
E. 4 hours.


TP speed= 85% of 500= 85*5

Time= Distance/speed= 950/ 85*5= 2 hrs

A is the answer
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Bunuel
A Super-Jet airplane is flying at an average speed of 500 miles per hour. The average speed of a Turbo- Prop airplane is 15% lower than that of a Super-Jet. How long will it take a Turbo-Prop airplane to fly 950 miles?

A. 2 hours.
B. 1 hour and 30 minutes.
C. 3 hours and 15 minutes.
D. 2 hours and 24 minutes.
E. 4 hours.


Turbo jet speed is 15% lower than Super Jet and by using rule of 10 % for quick calculation.

10% of 500 =500

So Turbo jet speed= 500-75= 425

Time taken= 950/425 = 2.abd (950 is more than double 425) .

The closest answer is D
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D

Sent from my A114 using GMAT Club Forum mobile app
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super jet travels 500 in 1 hr. to cover up 950 it will take somewhat less than 2 hrs... It will cover up 1000 m in 2 hrs
turbo prop will cover 1000 * 85 / 100 = 850 miles.
850 is 100 short of 950
which super jet will cover in 1/5th of an hour and since turbo prop is slower it will take 15% more time... 1/5th of an hour is 12 mins + 15 % would closely approximate to answer D
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H Bunuel , can you please explain how Option A is correct answer? I think it should be over 2 hours which is option D.

950 / 425 = over 2 hours.?



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