solve linear equation

plz solve it is the math problem

x takes 3 hours more than y to walk 30 km.but if x doubles its speed ,he id ahead of 4 km by 1 hours and 30 mins.find speeds of x and y
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1 Answer

????????????????????????? "is ahed av 4 km" ?????????????

?????????? yu sae sumthun bout "if x dubel his speed....

not kleer wot happen then
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