How to measure distances of two walls one behind other.

How to measure distances of two walls one behind other. In our school project we have to measure distance of two walls one behind other, for example tube, cubic and etc... Which ARDUINO is the most suitable for measuring distance of two echos and at the same time results are display or transfered to computer. To measure distance of the first wall is not problem but other wall behind (its distance) has to be measure as well.

Does the ARDUINO capable of it? thanks for any assistance...

Any Arduino can be used to control a ranging sensor.

Do you mean the back wall is hidden by the front wall?

Measuring a distance between walls through one of the walls sounds like a tall order to me, if possible at all (and if so almost certainly way out of reach of a school project) so more details and sketch of the general setup are in order.