A car travels 100 km at a speed of 60 km/h and returns with a speed of 40 km/h. Calculate the average speed for the whole journey.

by

(A) 42 km/h
(B) 46 km/h
(C) 48 km/h 
(D) 50 km/h

🧠 Explanation (Math):

Given: 100 km at 60 km/h and 100 km at 40 km/h; average speed
Step 1: For equal distances, average speed = (2v₁v₂)/(v₁ + v₂)
Step 2: = (2×60×40)/(60+40) = 4800/100 = 48
Final Answer: 48 km/h