Book Maths Puzzle Numerical Ability

Two cyclists race on a circular track. Brown can ride once round the track in six minutes, and Robinson in four minutes. In how many minutes will Robinson overtake Brown?

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Book Other Question
Colonel Crackham says that his friend, Mr. Wilkinson, walks from his country house into the neighboring town at the rate of five miles per hour, and, because he is a little tired, he makes the return journey at the rate of three miles per hour. The double journey takes him exactly seven hours. Can you tell the distance from his house to the town? the number of lines that are parallel to 2x+6y+7=0 and have an intercept of length 10 between the coordinate axes is
a)0 b)1 c)2 d)infinite
plz solve dis q step by step