An aeroplane takes 20 hours to complete a journey flying at an average speed of
780 km/hr. Find the time taken for the same journey if it dien at average speed of
veighing 500
en mer
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Answered by
2
Answer:
ANSWER
⇒ Let the usual speed be xkm/hr
According to the question,
⇒
x
1200
−
100+x
1200
=1
⇒
x(100+x)
1200(100+x)−1200x
=1
⇒ 120000+1200x−1200x=100x+x
2
⇒ 120000=100x+x
2
⇒ x
2
+100x−120000=0
⇒ x
2
+400x−300x−120000=0
⇒ x(x+400)−300(x+400)=0
⇒ (x+400)(x−300)=0
⇒ x=−400 and x=300
Speed can not be negative.
∴ Original speed =300km/hr
'
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3
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