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:

t1=3 h v1=50 mph  s=t1 v1=3 50=150 mile  v2=30 mph s=t2 v2  t2=s/v2=150/30=5 ht_{1}=3 \ \text{h} \ \\ v_{1}=50 \ \text{mph} \ \\ \ \\ s=t_{1} \cdot \ v_{1}=3 \cdot \ 50=150 \ \text{mile} \ \\ \ \\ v_{2}=30 \ \text{mph} \ \\ s=t_{2} \cdot \ v_{2} \ \\ \ \\ t_{2}=s / v_{2}=150 / 30=5 \ \text{h}



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