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What is the correct answer?
4
An aeroplane covers a certain distance at a speed of 240 kmph in 5 hours. To cover the same distance in
1
2
3
hours, it must travel at a speed of:
A.
300 kmph
B.
360 kmph
C.
600 kmph
D.
720 kmph
Correct Answer :
D. 720 kmph
Distance = (240 x 5) = 1200 km.
Speed = Distance/Time
Speed = 1200/(5/3) km/hr. [We can write
1
2
3
hours as 5/3 hours]
∴
R
e
q
u
i
r
e
d
s
p
e
e
d
=
1200
x
3
5
k
m
/
h
r
=
720
k
m
/
h
r
.
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