Question
The speed of a boat in still water is 35 km/hr. If the
boat covers 150 km in upstream in 5 hours, then find the time taken by the boat to travel 200 km in downstream.Solution
Let the speed of the boat in still water and the speed of the current be ‘x’ km/hr and ‘y’ km/hr, respectively Upstream speed of the boat = (x – y) = 150/5 = 30 km/hr Or, 35 – y = 30 Or, y = 35 – 30 = 5 km/hr Therefore, downstream speed of the boat = 35 + 5 = 40 km/hr Required time taken = 200/40 = 5 hours
A ray of light hits a mirror and is reflected. If the mirror rotates by an angle 10° in one direction, then the reflected ray will rotate by
Lightning is seen before thunder because
Two numbers are in ratio of 7 : 10 and if the sum of the numbers is 119. Find the difference of the numbers.
If 60% of 80 = x% of 96. then x is.
Match List I with List II
Choose the correct answer f...
Which incident led Gandhi ji to with draw non-cooperation movement?
Box A has 10 g of gold and box B has 10 g of copper. 1 g of the material in B is added to A and mixed and 1 g of the resulting material in A is added to...
What is the next number 2, 9, 28, 65, __________.
The practice of erecting megaliths began about 3000 years ago, and was prevalent throughout the Deccan, South India, in the North-East and Kashmir. All ...
Sum of the two numbers is 6 times their difference. Then the numbers are in the ratio.
Relevant for Exams:
