# Drive to NJ

Ed drove to New Jersey at 30mph. He drove back home in 3 hours at 50 mph. How many hours did it take Ed to drive to New Jersey?

Result

t2 =  5 h

#### Solution:

$t_{ 1 } = 3 \ h \ \\ v_{ 1 } = 50 \ mph \ \\ \ \\ s = t_{ 1 } \cdot \ v_{ 1 } = 3 \cdot \ 50 = 150 \ mile \ \\ \ \\ v_{ 2 } = 30 \ mph \ \\ s = t_{ 2 } \cdot \ v_{ 2 } \ \\ \ \\ t_{ 2 } = s / v_{ 2 } = 150 / 30 = 5 = 5 \ \text { h }$

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