exam Maths Puzzle Numerical Ability

Judith rides her bike 2 mi/h faster than Kelly. Judith takes 48 minutes less to travel 50 mi/h than Kelly. What is each person's distance in miles per hr?

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Hi can someone please help me. Thanks in advance.
This is solving linear inequalities.

5[3t-(t-4)]-11<= - 12(t-6)-(-t) A water storage tank is shaped like a circular cylinder with half of a sphere at each end.Find the volume of the tank if the cylindrical section is 100 cm long with a 40cm diameter.Use 3.14 for pi.Round the final answer to two decimal places.