A
c
a
c
just from memory hope this helps
The faster car behind is catching up/closing the gap/gaining on
the slow truck in front at the rate of (90 - 50) = 40 km/hr.
At that rate, it takes (100 m) / (40,000 m/hr) = 1/400 of an hour
to reach the truck.
(1/400 hour) x (3,600 seconds/hour) = 3600/400 = <em>9 seconds</em>, exactly
The relationship between speed of a wave w, frequency f and wavelength

is

For the wave of our problem,

and f=60 Hz, so its speed is
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The best logical answer is A