Question

You normally drive on the freeway between San Diego and Los Angeles at an average speed of 105 km/h (65 mi/h), and the trip takes 1 h and 50 min. On a Friday afternoon, however, heavy traffic slows you down and you drive the same distance at an average speed of only 70 km/h (43 mi/h). How much longer does the trip take?

Answer 1

Answer: 2 hr 45 min

Step-by-step explanation:

Given

The average speed between San Diego and Los Angeles is
`105\ kmph`

time taken for this trip is
`1\ hr\ 50\ min\ or\ (11)/(6)\ hr`

Distance between San Diego and Los Angeles is

`\Rightarrow d=105* (11)/(6)\\\\\Rightarrow d=192.5\ km`

For Friday afternoon, the average speed is
`70\ km/h`

time taken to complete the trip is

`\Rightarrow t=(192.5)/(70)\\\\\Rightarrow t=2.75\ hr\ or\ 2\ hr\ 45\ min`