A) 2.5 km |
B) 2 km |
C) 3 km |
D) None of these |
A) 2.5 km |
\( \Large \frac{d}{4} - \frac{d}{5} = \frac{7\frac{1}{2}}{60} \)
\( \Large \frac{5d - 4d}{20} = \frac{15}{120} = \frac{1}8{}\)
\( \Large \frac{d}{20} = \frac{1}{8}\)
D = 2.5 km.