This is the question that I am stuck on.... Theinterstate distance between two c

Question

This is the question that I am stuck on.... Theinterstate distance between two cities is 150 km. (a) If you drivethe distance at the legal speed limit of 65 mi/hr, how long wouldthe trip take? (b) Suppose on the return trip you pushed it up to80 mi/hr(and didn't get caught). How much time would yousave? The issue I am having is that I cannot figure what equation Ishould use or how to set up the question. Any help would begreatly appreciated. Like I said I don't need someone tosolve it just help with what equation I need. Thanks This is the question that I am stuck on.... Theinterstate distance between two cities is 150 km. (a) If you drivethe distance at the legal speed limit of 65 mi/hr, how long wouldthe trip take? (b) Suppose on the return trip you pushed it up to80 mi/hr(and didn't get caught). How much time would yousave? The issue I am having is that I cannot figure what equation Ishould use or how to set up the question. Any help would begreatly appreciated. Like I said I don't need someone tosolve it just help with what equation I need. Thanks

Explanation / Answer

(a) Time taken to travel this distance is t = d / v                                                        = (150km) / (65km/hr)                                                        = 2.31 hr (b) In the return journey, the time taken to travel this distanceis                             t = (150km) / (80km/hr)                               = 1.875 hr Total time he saved = 2.31hr - 1.875hr = 0.435 hr                              = 26.1 min

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