Question

A motorist travelled 1/2 of his journey at 60km/h and completed the remaining 90km in 1 1/2 hour was his average speed for the whole journey​

Answer 1

Given:-

A motorist travelled half of his journey at 60km/h

and other half of 90km in half an hour.

To find:-

average speed

Solution:-

Let's understand the concept :-

for finding the average speed we need to divide total distance by total time.

Total distance:-

${:}\longrightarrow$90km+90km=180km

Total time:-

${:}\longrightarrow$ 1hour+half an hour+half an hour

=60+30+30minutes

=120minutes=2hour

Average time:-

${:}\longrightarrow$${\frac{Total\:distance}{Total\:time}}$

$={\frac{{\cancel{180}}}{{\cancel{2}}}}km/ph$

$=90km/ph$