orrect answerA girl reaches school on foot from her home in 24 minutes at a speed of 5 km/h and in return travels the same distance by cycling at a speed of 8 km/h. time took to get back by bicycle?Options15 minutes8 minutes10 minutes21 minutes
Question
orrect answerA girl reaches school on foot from her home in 24 minutes at a speed of 5 km/h and in return travels the same distance by cycling at a speed of 8 km/h. time took to get back by bicycle?Options15 minutes8 minutes10 minutes21 minutes
Solution
The first step is to find out the distance between the girl's home and her school. We know that she walks to school at a speed of 5 km/h for 24 minutes.
To convert her speed to km/minute, we divide by 60 (since there are 60 minutes in an hour). So, her speed in km/minute is 5/60 = 0.0833 km/minute.
Then, we multiply her speed in km/minute by the time it takes her to walk to school to find the distance. So, the distance is 0.0833 km/minute * 24 minutes = 2 km.
Next, we need to find out how long it takes her to cycle back home at a speed of 8 km/h. Again, we convert this speed to km/minute by dividing by 60. So, her cycling speed is 8/60 = 0.1333 km/minute.
Finally, we divide the distance by her cycling speed to find out how long it takes her to cycle home. So, the time is 2 km / 0.1333 km/minute = 15 minutes.
Therefore, the correct answer is 15 minutes.
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