Book Maths Puzzle Numerical Ability

I walk a certain distance and ride back by taking 25/4 hr altogether .Icould walk both ways in 31/4 hr.how long would it take me to ride both ways?

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Book Other Question

A cloth –merchant disposed of 120 m of shop-soiled curtain material for Rs. 900 and thus suffered a loss of 37.5%.Find the cost price of the material per metre. zafars marks his goods at such a price that after allowing a discount of 12% for cash payment, he still makes a profit of 10%. find the marked price of the article which cost him rs. 7000