Question

A body covers 12 km in first hour and 36 km in next three hours of his journey. His average speed is equal to?

A) 20 km/h

B) 36 km/h

C) 12 km/h

D) cannot be calculated
​

Answer 1

Answer:

A)20 KM/h or D) cannot be calculated

Answer 2

Working out:

In the question, we are given with distance travelled by the body in particular time intervals:

• Covers 12 km in 1st hour.
• Covers 36 km in next three hours.

We have to find the average speed. Average speed is calculated by dividing the total distance travelled by a body by total time taken.

According to question,

• Total distance = 12 km + 36 km = 48 km
• Total time taken = 1 hr + 3 hrs = 4 hrs

Finding the average speed,

⇛ Average speed = Total distance / Total time

⇛ Average speed = 48 km / 4 hrs

⇛ Average speed = 12 km/hr

Average speed of the body:

$\large{ \boxed{ \bf{ \purple{12 \: km {h}^{ - 1} (c) }}}}$

And we are done !!

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