Answer:
it is B
Step-by-step explanation:
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The acceleration of the fire truck is 1.666 m/s².
<u>Step-by-step explanation:</u>
Acceleration is the measure of change in velocity with respect to time. So as the initial velocity of the fire truck is given as 0 km/hr and the final velocity is given as 66 km/hr. So at first the truck is at rest and on switching on the engine, the truck gets to the velocity of 66 km/hr in 11 seconds.

But first the units of velocity should be changed from km/hr to m/s
1 hour = 3600 seconds
1 km = 1000 m
So, 
Converted Velocity = 18.33 m/s
Then, the acceleration will be

Acceleration = 1.666 m/s²
So, the acceleration of the fire truck is 1.666 m/s².
To prove that these two triangles are congruent by Hypotenuse Leg theorem, we need to know that a hypotenuse and a leg are congruent or equal. Since we already see that a leg is congruent, we now need to know that the hypotenuses are congruent. The hypotenuses are CA and DA, meaning that to prove that these two triangles are congruent by HL, we need to know that CA is congruent to DA, or the second option.