A transport company is running 4 buses between two towns which are 50 kms apart. Seating capacity of each bus is 40 passengers. The following particulars were obtained from their books for April month...

A transport company is running 4 buses between two towns which are 50 kms apart. Seating capacity of each bus is 40 passengers. The following particulars were obtained from their books for April month of the current year:

Actual passengers carried were 75 per cent of the seating capacity. All the four buses run on all days of the month. Each bus made one round trip per day. Find out the cost per passenger km.