There is a leak in the bottom of a cistern. When the cistern
is thoroughly repaired, it would be filled in 3 ? hours. It
now takes half an hour longer. If the cistern is full, how
long will the leak take to empty the cistern?
(a) 24 hours
(b) 28 hours
(c) 21 hours
(d) 27 hours
(e) None of these
Answer Posted / pradeep
the amount of work done by the leak in one hour is
(2/7)-(1/4)=1/28....
Therefore the amount required to empty the whole tank is 28
hours
Is This Answer Correct ? | 6 Yes | 9 No |
Post New Answer View All Answers
George while driving along the highway saw road markers which are at equal distances from each other. He crosses the markers every 20 seconds. If he increases his speed by x meters per second, he crosses the markers at every 15 seconds. But if he increases his speed by y meters per second, he crosses the marker at every 10th second. If y-x = 40 meters per second, then what is the distance between two markers.
vernanlar : place :: finger print : ?
if the sum of five consecutive nos. 35? how many prime numbers are there :
Supposing a clock takes 7 seconds to strike 7. How mlong will it take to strike 10?
cgl2010 tier 2 ki merit kya rhgi
A family I know has several children. Each boy in this family has as many sisters as brothers but each girl has twice as many brothers as sisters. How many brothers and sisters are there?
Person who decided to go to weekend trip should not exceed 8 hrs driving in a day. Average speed of forward journey is 40 miles/hour . Due to traffic in sundays ,in return journey average speed is 30mph . How far he can select a picnic spot ?
A lorry starts from Banglore to Mysore at 6.00 A.M,7.00am.8.00 am.....10 pm. Similarly one another starts from Mysore to Banglore at 6.00 am,7.00 am, 8.00 am.....10.00pm. A lorry takes 9 hours to travel from Banglore to Mysore and vice versa. A lorry which had started at 6.00pm will cross how many lorries.
To 15 lts of water containing 20% alcohol, we add 5 lts of pure water. What is % alcohol.
In a lock of 4 rings there r five characters how many unsuccessful attempts can be made ?
Make a square by drawing only one line
There are 9 balls of equal size and same weight (they look similar) except 1. How may weighs required to find the dissimilar ball using a weighing balance?
How many mashes are there in 1 square meter of wire gauge if each mesh is 8mm long and 5mm wide ?
What is the height of the cone of diameter 12 cm that is formed after melting a sphere of 6 cm diameter?
Four Members A, B, C, D are playing a game .A person losing a game should double the amount of others .B, C, D are losing in order after three games .The amount after 3 games are A&B having 40,D is having 16&C 80. Who started with small amount of money?