Question

A man travels 50 km at speed 25 km/h and next 40 km at 20 km/h and there after travel 90km at 15 km/h. His average speed is

A) 18 B) 25 C) 20 D) 15

Answer 1

Answer:

Given:

• A man travels 50 km at speed 25 km/h and next 40 km at 20 km/h and there after travel 90km at 15 km/h.

Find:

• Find his average speed.

Using formula:

★ ${\sf{\underline{\boxed{\orange{\sf{ Average \: speed = \dfrac{Total \: distance}{Total \: time}}}}}}}$

Calculations:

⇒ $\bold{Average \: speed = \dfrac{50 + 40 + 90}{2 + 2 + 6}}$

⇒ $\bold{Average \: speed = \cancel{\dfrac{180}{10}}}$

⇒ ${\sf{\underline{\boxed{\red{\sf{Average \: speed = 18 \: km/hr}}}}}}$

Therefore, 18 km/hr is his average speed.