X and Y are two towns. A man goes from town X to town Y at an average speed of 30 km per hour and returns at an average speed of 20 km per hour. Find the distance between the two towns if a man takes 10 hours on the whole.
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Correct option is
Let the distance from X to Y be dkm
Let the time taken from X to Y at a speed of 30km/hr be t1
And, Let the time taken from Y to X at a speed of 20km/hr be t2