Gmate Exam Numerical Ability

If m and n are natural umbers such that
(2^m)-(2^n)=960,what is the value of m?

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Gmate Other Question

Square root of 3 + √5 is Supriya runs a marathon race in 50 minutes at an average speed of 48 km/hrs . in order to set a national record she needs to win the race in 40 minutes considering that her speed remains constant at what minimum speed should she run to set the record?