Question

A motorist travelled 1/2 of his journey at 60 km/h and completed the remaining 90 km in 3/2 hours. What was his average speed for the whole journey?
Please explain me step by step. ​

Answer 1

Step-by-step explanation:

let the total distance be

$x$

then

time taken by journey when speed is 60km/he

$\frac{x}{2} \times \frac{1}{60} hour$

$\frac{x}{120} hr$

time taken by journey when speed is 90 km/hr

$\frac{3x}{2} \times \frac{1}{90} \: hour$

$\frac{x}{60} hour$

average speed =total distance/total time

$\frac{x}{ \frac{x}{60} + \frac{x}{120} }$

$\frac{x}{ \frac{3x}{120} }$

$40 \frac{km}{hr}$

hope it helps

pls mark brainliest

Answer 2

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