Ram Travels A certain distance of 3 kilometre per hour and reaches 15 minutes that if you travel at a 4 kilometre per hour he reaches 15 minute earlier the distance he has travel is
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A speed of 3 km/hr means that you can cover 3km in 1 hour or 60 minutes. That means you can cover 1 km in 60/3 or 20 minutes.
Similarly a speed of 4 km/h means that you can cover a distance of 1 km in 60/4 or 15 minutes.
So you save 5 minutes (20 - 15) to cover 1 km when you increase your speed from 3 kmph to 4 kmph.
Ram is saving 30 minutes in total (15 minutes late vs 15 minutes early).
5 minutes are saved every km.
That means he is travelling 30/5 or 6 km in total.
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