Question

A person travelled at 80 km/h from x toy, from y to x at 60 km/h and again travelled to y at a speed of 30 km/h find the average speed of all journey?

• A. 56 km/h
• B. 50 km/h
• C. 48 km/h
• D. 16 km/h

Answer 1

Answer:

C. 48 km/h

Average speed= 3xyz/(xy + yz + xz) = 3 × 80 × 60 × 30/(80×60 + 60 × 30 + 80 × 30) = 48 km/hr