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At 65km/h, Alfred can reach home in 50 minutes. At what speed should he drive his car so that he can reach home 10 minutes earlier?

Correct answer:

v2 =  81.25 km/h

Step-by-step explanation:

v1=65 km/h t1=50 min h=50:60  h=0.83333 h Δ=10 min h=10:60  h=0.16667 h  s=v1 t1=65 0.8333=632554.1667 km t2=t1Δ=0.83330.1667=320.6667 h  v2=s/t2=54.1667/0.6667=81.25 km/h

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