No this rule is not applicable to the 5th and later shells. In these the no. of electrons are 32, 18 and 8 respectively. this is because no matter how many shells are added the orbitals will remain the same from s to f and the maximum electrons any shell can hold cannot increase 32.
The time difference between the two tanks
is 3.5 - 2 s = 1.5 s
(or the sound tanks this much tie to travel between the tanks)
the distance between the two tanks is = 510 m
so, the speed of sound would be
s = distance / time
s = 510 / 1.5 m/s
s = 340 m/s
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