Correct Answer - Option 1 : 80 km/h

**Given:**

The total distance covered is 160 km

A part of the journey covered in 40 min

Another part of the journey covered in 80 min

**Formula used:**

\(Speed = \frac{{Distance}}{{Time}}\)

\(Average\;speed = \frac{{Total\;distance}}{{Total\;time}}\)

**Calculation:**

Distance of first part of journey = (3/4) × 160 = 120 km

Distance of second part of journey = 160 - 120 = 40 km

Total time (in minutes) = (40 + 80) min

⇒ Total time (in hours) = 120/60 = 2 h

⇒ \(Average\;speed = \frac{{120 + 40}}{2} = \frac{{160}}{2} = 80\;km/h\)

**∴**** The average speed of the journey is 80 km/h**