Question

A vehicle travels $4 \, km$ with speed of $3\, km / h$ and another $4 \, km$ with speed of $5\, km / h$, then it's average speed is

• A. $3.75\, km / h$
• B. $4.25\, km / h$
• C. $3.50 \, km / h$
• D. $4.00\, km / h$

Answer 1

Answer: (A)

$3.75\, km / h$

Answer 2

The correct answer is (A) : $3.75\, km / h$
Vav​2​=31​+51​=158​
⇒Vav​=415​=3.75km/h