Subject: General Aptitude · Chapter: Time and Distance · Exam: 2006 · Marks: · Difficulty:
An aeroplane flies twice as fast as a train which covers 60 miles in 80 minutes. What distance will the aeroplane cover in 20 minutes?
(a)30 miles
(b)35 miles
(c)40 miles
(d)50 miles
Answer
Answer (as printed): A
Explanation
Time taken to cover 60 miles $=80 \mathrm{min}=\frac{4}{3} \mathrm{hrs}$. $$\text { ∴ Speed of the train }=\left(60 \times \frac{3}{4}\right) \mathrm{mph}=45 \mathrm{mph} .$$ Speed of the aeroplane $=(2 \times 45) \mathrm{mph}=90 \mathrm{mph}$. Distance covered by the aeroplane in 60 min = 90 miles. Distance covered by the aeroplane in 20 min $$=\left(\frac{90}{60} \times 20\right) \text { miles }=30 \text { miles. }$$