Asked by Anonymous
Before taking off, a plane travels at the speed of 1/4 km per second. The runway is 5km. How long does it take for the plane to get to the end of the runway?
Answers
Answered by
mathhelper
Wow, 1/4 km/s on the runway????
that's 900 km/hour!
anyway ....
this superplane would reach the end of the runway in 5/(1/4) or 20 seconds
or
by ratios:
5/(1/4) = x/1
1/4 x = 5
x = 20
Who makes up these illogical questions.
A 747, one of the largest planes, needs a runway of 1.4 miles or about 2.4 km
Takeoff speed of a 747 is close to 300 km/h and that of a fighter jet is about 250 km/h
that's 900 km/hour!
anyway ....
this superplane would reach the end of the runway in 5/(1/4) or 20 seconds
or
by ratios:
5/(1/4) = x/1
1/4 x = 5
x = 20
Who makes up these illogical questions.
A 747, one of the largest planes, needs a runway of 1.4 miles or about 2.4 km
Takeoff speed of a 747 is close to 300 km/h and that of a fighter jet is about 250 km/h
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