A person travels between two towns. At 60 km/h, he arrives 1.5 hours early. At 40 km/h, he arrives 1 hour late. What is the distance between the towns?

উত্তর দেখান ও ব্যাখ্যা

উত্তর: (A) 300 km

ব্যাখ্যা

d/40 − d/60 = 2.5 gives d/120 = 2.5, d = 300 km.