[44 mph] A car drives 40 miles on local roads at 20 mph, and 180 miles on the highway at 60 mph, what is the

For Competitive Exams

A car drives 40 miles on local roads at 20 mph, and 180 miles on the highway at 60 mph, what is the average speed of the entire trip?

36 mph

40 mph

44 mph

52 mph

58 mph

Explanation:
In phase #1 of the trip, the car traveled 40 mi at 20 mph. That time of this phase was:

time = distance/rate = (40 mi)/(20 mph) = 2 hr

In phase #2 of the trip, the car traveled 180 mi at 60 mph. That time of this phase was:

time = distance/rate = (180 mi)/(60 mph) = 3 hr

The total distance of the trip = 40 mi + 180 mi = 220 mi

The total time of the trip = 2 hr + 3 hr = 5 hr

The average speed of trip is given by

speed = distance/time = (220 mi)/(5 hr) = 44 mph

Additional Questions

litres of water are poured into an aquarium of dimensions 50cm length, 30cm breadth, and 40cm height. How high (in cm) will the water rise? (1 litre = 1000cm³)	Answer
If an object travels at five feet per second, how many feet does it travel in one hour?	Answer
What is the average (arithmetic mean) of all the multiples of ten from 10 to 190 inclusive?	Answer
A cubical block of metal weighs 6 pounds. How much will another cube of the same metal weigh if its sides are twice as long?	Answer
In a class of 78 students 41 are taking French, 22 are taking German. Of the students taking French or German, 9 are taking both courses. How many students are not enrolled in either course?	Answer
For how many integer values of n will the value of the expression 4n + 7 be an integer greater than 1 and less than 200?	Answer
In the figure above AD = 4, AB = 3 and CD = 9. What is the area of triangle AEC ?	Answer
A certain animal in the zoo has consumed 39 pounds of food in six days. If it continues to eat at the same rate, in how many more days will its total consumption be 91 pounds?	Answer
A student s average (arithmetic mean) test score on 4 tests is 68. What must be the student s score on a 5th test for the student s average score on the 5 tests to be 70?	Answer
Which of the following could be a value of x, in the diagram above?	Answer

Share with Friends