The actual distance you biked is 1.2+0.5=1.7 miles.

The length of the diagonal, x, is the hypotenuse of the right triangle formed by the 2 given distances as the legs. By Pythagorean Theorem, \(\displaystyle{1.2}^{{2}}+{0.5}^{{2}}={x}^{{2}}\)

\(\displaystyle{1.44}+{0.25}={x}^{{2}}\)

\(\displaystyle{1.69}={x}^{{2}}\)

\(\displaystyle√{1.69}={x}\)

x=1.3 miles

So, you would have bikes 1.7−1.3=0.4 miles fewer.

The length of the diagonal, x, is the hypotenuse of the right triangle formed by the 2 given distances as the legs. By Pythagorean Theorem, \(\displaystyle{1.2}^{{2}}+{0.5}^{{2}}={x}^{{2}}\)

\(\displaystyle{1.44}+{0.25}={x}^{{2}}\)

\(\displaystyle{1.69}={x}^{{2}}\)

\(\displaystyle√{1.69}={x}\)

x=1.3 miles

So, you would have bikes 1.7−1.3=0.4 miles fewer.