Let A be the sum of the last four digits and let B be the last...

Let A be the sum of the last four digits and let B be the last digit of your 8-digit student ID. (Example: For 20245347, A = 19 and B = 7) On a road trip, a driver achieved an average speed of (48.0+A) km/h for the first 86.0 km and an average speed of (43.0-B) km/h for the remaining 54.0 km. What was her average speed (in km/h) for the entire trip? Round your final answer to three significant figures.

Solutions

Expert Solution

t1 = 86/(48+A) = 86/67 = 1.28 hr

t2 = 54/(43-B) = 54/36 = 1.5 hr

total time t = t1+t2 = 2.78 hr

total distance = 86+54 = 140 km

total avg velocity = 140/2.78 = 50 km/hr

genius_generous answered 1 year ago

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