An aeroplane flies twice as fast as a train which covers 60 kilometers in 80 minutes. What distance (in kilometers) will the aeroplane cover in 20 minutes ?
Answers
Answer:
Time taken to cover 60 miles = 80 min = 43
hrs
∴ Speed of the train = (60×34)
mph = 45 mph
Speed of the aeroplane = (2 × 45) mph = 90 mph
Distance covered by the aeroplane in 60 min = 90 miles
Distance covered by the aeroplane in 20 min :
= (9060×20)
miles
= 30 miles
Given : An aeroplane flies twice as fast as a train which covers 60 kilometers in 80 minutes.
To Find : What distance (in kilometers) will the aeroplane cover in 20 minutes
Solution:
a train covers 60 kilometers in 80 minutes
=> train covers distance in 80 minutes = 60 km
An aeroplane flies twice as fast
=> aeroplane covers distance in 80 minutes = 60 * 2 km
=> aeroplane covers distance in 80 minutes = 120 km
=> aeroplane covers distance in 1 minutes = 120/80 km
=> aeroplane covers distance in 1 minutes = 3/2 km
=> aeroplane covers distance in 20 minutes = 20 * 3/2 km
=> aeroplane covers distance in 20 minutes = 30 km
the aeroplane cover in 20 minutes is 30 km
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