It takes 2

It takes 7 1/5 seconds for a jet to fly 1 km. How long does it take for this jet to fly 3/4 of a km?

Correct answer:

t2 =  5 25 = 27/5 s

Step-by-step explanation:

t1=751=7+51=57 5+1=535+1=536=7.2 s s1=1 km s2=3/4=43=0.75 km  v1=v2 s1/t1 = s2/t2 = const  r=s2/s1=43/1=4 13=43=0.75 t2=t1 r=536 43=5 436 3=20108=527 s=552 s=5.4 s

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