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How to do quick conversion with these different metrics? Can

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How to do quick conversion with these different metrics? Can [#permalink]  13 Oct 2007, 06:28
How to do quick conversion with these different metrics? Can you show how you do it so its quicker? Say for st2 to get to miles/hr.[/b]
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statement 1

you are really being asked for is 10/x > 2 ? ---> via = time*speed

is 5 > x ---> speed in miles

to convert always use fractions = 1 mile = 8/5 km

5*8/5 = 8 --> five mile per hour converted into km per hour

so is 8 > x where x < 6.4 km ? ---> sufficient

statement 2

9 minutes per km is equal to 9*5/8 minutes per mile = 45/8

since via = time*speed then:

is 5 > x ---> speed in miles ?

45/8 --> in minutes ---> 60/(45/8) in hours ---> 10.66 miles per hour

is (50/8)/10.66 > 2 ?

sufficient

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