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You are to drive to an interview in another town, at a distance of 330 km on an expressway. The interview is at 11:15 a.m. You plan to drive at 100 km/h, so you leave at 8:00 a.m. to allow some extra time. You drive at that speed for the first 120 km, but then construction work forces you to slow to 43.0 km/h for 43.0 km. What would be the least speed needed for the rest of the trip to arrive in time for the interview?
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Added Tue, 18 Aug '15
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total distance=330 Km

total time =3hr 15 min =195 min

Now total distance covered =120+43 =163 Km

total time taken =120/100 +43/43 =132 min

So left distance =167 Km

time left =63 min

so speed= 167/(63/60) =159.04 Km/hr (ans)
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Added Tue, 18 Aug '15
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