Answer:
The value of x is 27
because 2 times 27 equals 54 minus 7 equals 47
We need to solve the speed formula for d. To do so, let's start by moving the number of the left hand side:

Square both sides to get rid of the square root:

Now plug the known value of the speed to find the distance:

So the closest answer is the last one: d=0.155km
The answr is 2 okay that’s the answer