The interstate on-ramp is 5.5 km West of your home, and on leaving for grandmother’s house you are only able to accomplish an average velocity of 38 km/hr between your home and the on-ramp. At the on- ramp, you wait for traffic, for 2.0 min – and then are able to proceed toward grandmother’s house. If you wish to arrive there, which is 15 km South of the on-ramp, over a river and through some woods, having achieved an average velocity of 42 km/hr, how fast do you need to drive south on the interstate highway?
A. 58 km/hr
B. 48 km/hr
C. 78 km/hr
D. 39 km/hr
C. 78 km/hr
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