Question

On a 60km track a train travel the first 30km with a uniform speed of 30km/hr. How fast must it travel the next 30 km so as to average a speed of 40km/hr for the entire trip keep the answers in km/hr

Answer 1

Answer:

50 km/hr (to make up the loss in speed)

Explanation:

Fifty km/hr

Answer 2

Explanation:

Where t₁ = 30/30 = 1 h

$\sf \: 40 = \frac{60}{1+\frac{30}{v} }$

40 (v + 30) = 60 v

v = 60 km/h

Hence, The