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# A driver traveled 1 mile at t miles/hour. If the speed is

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A driver traveled 1 mile at t miles/hour. If the speed is [#permalink]  22 Jul 2006, 05:26
A driver traveled 1 mile at t miles/hour. If the speed is t+20 miles/hour, it will take 4 minutes less. What is the value of t?
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Re: Speed Distance Time [#permalink]  22 Jul 2006, 12:41
getzgetzu wrote:
A driver traveled 1 mile at t miles/hour. If the speed is t+20 miles/hour, it will take 4 minutes less. What is the value of t?

let Time as T

1 = t*T = (t+20)(T-4/60)

t = 10 miles/hour
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Re: Speed Distance Time [#permalink]  22 Jul 2006, 14:26
getzgetzu wrote:
A driver traveled 1 mile at t miles/hour. If the speed is t+20 miles/hour, it will take 4 minutes less. What is the value of t?

Time T = 1/t

1 = (t+20) (1/t -4)

solve for t
Re: Speed Distance Time   [#permalink] 22 Jul 2006, 14:26
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