Time taken by a boat to cover 180 km in downstream is the same as to cover 140 km in upstream. Find the time taken by the boat to cover 360 km in downstream, if the speed of the boat in still water is 40 km/h.
ATQ, Let the speed of the stream be 'x' km/h. ATQ: We know that, Downstream speed of a boat = Speed of the boat in still water + speed of the stream Upstream speed of a boat = Speed of the boat in still water - speed of the stream 9(40−x) = 7(40+x) 360−9x = 280+7x 16x = 80 x = 80/16 x = 5 Therefore, speed of the stream = 5 km/h Therefore, time taken to cover 360 km in downstream = 360/(40+5) = 360/45 = 8 hrs
In the year 2014, the population of a village P was 20% more than the population of village R.In the year 2015, after increasing by 40%, total populatio...
In a ward member election, a candidates secure 67% of the votes and is elected by majority of 5100 votes. The total number of votes polled is?
5% of a = b, then b% of 20 is the same as __________.
Rakesh obtained 25% more marks than Ambuj Suresh obtained 40% less marks than Rakesh. Marks obtained by Suresh are what percent less than marks obtaine...
The respective ratio of monthly income of A to monthly income of B is 12:13, and A’s saving is (100/19)% more than B’s saving. Find the expenditure ...
Raj's income is ₹60,000 and his expenditure is ₹40,000. If his income is increased by 25% and expenditure by 15%, then what will be the percentage i...
A man spent 77% of his income in May. If his savings is increased by 30% in June and becomes Rs. 2990, then find the income of man in May.
Ali the barber shaved 38% of his customers and gave a haircut to 76% of his customers. He charged Rs. 12 for a shave and Rs. 9 for a haircut. If 25% of ...
The difference between the value of the number increased by 10% and the value of the number decreased by 20% is 72. Find the number.
A student multiplied a number by 3/5 instead of 5/3, What is the percentage error in the calculation ?
...