Question

Akash Travels the first 50 kilometre of its journey at an average speed of 25 metre per second and the next 120 km at an average speed of 80 kilometre per hour at the ka complete the blood part of its journey at an average speed of 90 km per hour in 35 minutes find the average speed of its entire journey giving your answer in kilometre per hour​

Answer 1

$\bf \: Avg \: Speed = \frac{50 + 40 + 90}{ \frac{50}{25} + \frac{40}{20} + \frac{90}{15} } = \: 18 km/hr$