A car averages 55 mph for the first 4 hours of a trip and
averages 70 mph for each additional hour. The average speed
for the entire trip was 60 mph. How many hours long is the trip?
- 8 Answers
- 33970 Views
- Infotech, I also Faced
- E-Mail Answers
Answer Posted / aprameya
avg speed = (total distance)/total time)
60 = (55 + 55 + 55 + 55 + 70n)/(4 + n)
where n = number of hours after 4 hours..
v get n = 2.. => total duration is 2hrs + 4hrs = 6hrs
| Is This Answer Correct ? | 28 Yes | 2 No |
Post New Answer View All Answers
A train 100 meter long takes 3 second to cross a man walking at the rate of 6km/hr in a direction opposite to that of the train. Find the speed of the train.
Find the next series: AA AB BC CE ?
The cost of one pencil, two pens and four erasers is Rs.22 while the cost of five pencils, four pens and two erasers is Rs.32.How much will three pencils, three pens and three erasers cost?
Find the distance when they meet from starting point.
A pipe can fill a tank in 30 min B can fill in 28 min then if 3/4 th of tank can be filled by B pipe and after wards bothare opened then how much time is required by both the pipes to fill the tank completely. note: the values of A and B may slitely vary be ware.
Given 10 alphabets out of which 5 are to be chosen. How many words can be made with atleast one repetition.
in space ship 5men are going1.doctor,drug asdditive 2.lady lawer has done crime 3.teacher emotinally imbalanced 4. 18 year old aeruonautical engineer 5. noble lauraut .suddenly some thing happend and oxygen is available to only three people to use which of three you choose
govern of irda,sebi and rbi
the minimum of (2x+1)**2 + (x+2) is at x =
A plane moves from 9? N40? E to 9? N40? W. If the plane starts at 10 am and takes 8 hours to reach the destination, find the local arrival time.
There are 1997 doors in the courts. 1997 people came out from each door. One door is closed. That many people came out from each door. This continues till a single person come out of the single open door. Find the no of people inside the court?
Each row of letters or numbers has a rule connecting them. Write the next number or letterin the brackets. 1 , 4 , 9 , 16 , 25 , 36 , (_ _ _)
A monkey starts climbing up a tree 20ft. tall. Each hour, it hops 3ft. and slips back 2ft. How much time would it take the monkey to reach the top?
Conversation between two mathematicians: first : I have three children. The product of their ages is 36 .. If you sum their ages . it is exactly same as my neighbour's door number on my left. The second mathematician verifies the door number and says that the not sufficient . Then the first says " o.k one more clue is that my youngest is the youngest" Immediately the second mathematician answers . Can you answer the question asked by the first mathematician? What are the children ages?
what is mean by aptitude test? how to write this paper?
