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
- 33932 Views
- Infotech, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / name
assume the no of additional hours be 'x'. then total
distance is given by
55*4+70*x = 60(4+x)
which on solving, gives x=2.
which gives the total hours travelled to be 6 hours.
i think this is correct. not sure........
| Is This Answer Correct ? | 34 Yes | 5 No |
Answer / 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 |
Answer / ayan
write answer is 6 i got this same question in the interview
| Is This Answer Correct ? | 14 Yes | 5 No |
Answer / shobhit awasthi
It's very simple
When we calculate we will find that
55*4=220
and
also
70*2=140
and as question said that the average speed is 60 so
220+140=360/6=60 that's it
No other option is satisfying the average speed condition.
| Is This Answer Correct ? | 8 Yes | 5 No |
Answer / kondayya
we have
(55*4+70*x)/(4+x)=60
by trial and error method,
put x=1,x=2,........
ans=2
| Is This Answer Correct ? | 9 Yes | 10 No |
Answer / shyam
avg speed = (total distance)/(total time)
car first travels 4hrs.. let us assume it travels for nhrs
after 4 hrs.. So it keeps up an avg speed of 70mph for n hrs
hence 60 = (55+70n)/(4+n) => n = 18.5hrs
therefore total duration is 18.5 + 4 = 22.5hrs
| Is This Answer Correct ? | 4 Yes | 23 No |
It takes five minutes to pass a rumor from one person to two other persons. The tree of rumor continues. Find how many minutes does it take spread the rumor to 768 persons.
what is the diode?
Rajini says ravismother is the only daughter of his mother how is rajini related to ravi
who is the mahatma gandi
when a group photograph is taken ,all the seven teachers should be in the first row and all the twenty students should be in the second row .if two corners of the second row are reserved for the two tallest students , interchangeable only between them and if the middle seat of the front row is reserved for the principal , how many arrangements are possible?
A man gets x/y of Rs.10 and y/x of Rs.10. He returns Rs.20. The Answer choices are a) He may not lose b) He may lose c) He always loses d) Cannot be Determined
hi,i would like to know sbi clerical exam syllabus
there are 27 coins in which 0ne is heavier than rest(all equal weight).how many measurements are needed to isolate that odd one.
Sita bought a handbag for Rs. 144 and got a percentage of profit equal to the cost price of the handbag. What is the cost price of the handbag?
In the series 0, 3, 8, 15,__ What is the next number?
There are 9 balls of equal size and same weight(they look similar) except 1. How many weights required to find the dissimilar ball using a weighing balance?
Find the next letter in the series Q,W,E,R,T,--
English 
