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A car moves with a speed of $40\ km/h$ for 15 minutes and then with a speed of $60\ km/h$ for the next 15 minutes. The total distance covered by the car is:
$(i).\ 100\ km$
$(ii).\ 25\ km$
$(iii).\ 15\ km$
$(iv).\ 10\ km$
The correct answer is $(ii).\ 25\ km$
Explanation:
Given:
A car moves with a speed of $40\ km/h$ for 15 minutes and then with a speed of $60\ km/h$ for the next 15 minutes.
To do:
To find the total distance covered by the car.
Formula to be used:
$ Distance = Time\times Speed$
When the car moves with a speed of $40\ km/h$ for 15 minutes:
Distance$_{1}=15 min \times 40 km/h$
$=\frac{15}{60}\ h\times 40\ km/h$
$=10\ km$
When the car moves with a speed of $60\ km/h$ for the next 15 minutes:
Distance$_{2}=15\ min\times 60\ km/h$
$=\frac{15}{60}\ h\times 60\ km/h$
$=15\ km$
Total distance $=Distance_1+Distance_2$
$=10\ km + 15\ km$
$=25\ km$
Therefore, the total distance covered by the car is $25\ km$.
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