Question

A car travels first 30 km with a uniform speed of 60 km per hour and the next 30 km with a uniform speed of 40 km per hour find the total time of journey and the average velocity of the car

Answer 1

Hii..
Here is your answer..

Solution:-
Distance travelled first=30km
Speed =60km/h
So,
Time =Distance/Speed
$= > \frac{30}{60} = \frac{1}{2} h$
Distance travelled second time=30km
Speed=40km/h
So,
Time =D/S
$= > \frac{30}{40} = \frac{3}{4}h$
Now,
Total Distance travelled=30+30
$= > 60km$
Total time taken =
$= > \frac{1}{2} + \frac{3}{4} \\ = > \frac{2 + 3}{4} \\ = > \frac{5}{4}$
We know that,
$average \: speed = \frac{total \: distance}{total \: time \: taken}$
$= > \frac{60}{ \frac{5}{4} }$
$= > \frac{60 \times 4}{5} \\ = > \frac{240}{5} \\ = > 48$
Hence,
Average speed is 48km/h

Hope it helps uh...✌️✌️✌️