Question

A column of men, extending 250 m in length takes one
hour to march through a street at the rate of 50 paces a
minute, each pace being 75 cm. Find the length of the
street.
a)2 km b) 1 km c)1.5 km d)2.5 km​

Answer 1

Answer:

Speed of the column of men = (50 x 75) / (100 x 60) = 5/8 m/sec.

Let the length of the street be L metres

∵ (L + 250) = (60 x 60 x 5) / 8 = 2250 metres

⇒ L = (2250 - 250) m

∴ L = 2000 m = 2 km.