exam Maths Puzzle Numerical Ability

A cyclyist bikes at a constant speed for 20 miles. He then returns home at the same speed but takes a different route. His return trip takesone hour longer and is 25 miles. Find his speed.

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exam Other Question
How do you graph the problem y=|x+3|-2 a biker rode 3 hours with a wind of 6 km/h. when he was returnin against the same wind it took 5 hours. what his speed in still air.