You drive on the freeway between San Francisco and Sacramento at an average speed of 96 km/h (60 mi/h), and the trip takes 2 h and 10 min. On a rainy day you slow down and drive the same distance at an average speed of 80 km/h (50 mi/h). Question: ?

Question

How much longer does the trip take?

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Answer 1 · 2018-06-26T03:26:40

26 minutes more

During the first trip
#V_(av) = 96km*hr^(-1)#

#t=2hr 10min = 13/6 hr#

Total distance travelled(D) is

#rArr D=v_(av)*t rArr D=96*13/6 rArr D=208km#

During the second trip,
#V_(av) = 80 km*hr^(-1)#

#D = 208km#

#t=D/V_(av) rArr t=208/80 rArr t=2.6 hr rArr t=2hr 36min#

This time is 26 minutes more than previous one.