Question

A man drives to his office at 60 km/hr and returns home along the same route at 30 km/hr. Find the average speed for the entire journey.

• A. 40 km/hr
• B. 45 Km/hr
• C. 50 Km/hr
• D. 55 Km/hr

Answer 1

Answer: (A)

40 km/hr

Answer 2

The speed of a man went to a place =$60km/h$
The speed of a man returning to the same place =$30km/h$
$Distance = Speed \times Time$
$Total Distance = Average Speed \times Total Time$
Let us consider the Distance as D Total distance covered by the Man =$D+D = 2D$
$Speed1= 60 km/hr$
$Speed2 = 30 km/hr$
$Time1=\frac{D}{60}$
$Time2 = \frac{D}{30}$
$Total Time = \frac{D}{60} + \frac{D}{30} = \frac{D}{20}$
$Average Speed = \frac{2D \times 20}{D}$
$Average Speed = 40km/hr$
The correct answer is (A): 40 km/hr