When travelling downstream, a boat takes 5 hours to travel 300 km. If the speed of the stream is (2/5)th of downstream speed of the boat, then find the time taken by the boat to cover 360 km in still water.
Downstream speed of the boat = 300/5 = 60 km/hr Speed of the stream = 60 x (2/5) = 24 km/hr So, speed of the boat in still water = 60 – 24 = 36 km/hr Required time taken = 360/36 = 10 hours
When a number is increased by 20% then the number obtained is 72 less than thrice the original number. Find the original number.
16 4 2 1.5 1 1.875
...The value of
Find the average of first 21 whole numbers.
When 1062, 1134 and 1182 are divided by the greatest number x, the remainder in each case is y. What is the value of (x – y) ?
Find the sum of all those 3-digit numbers which when divided by 10 leave a remainder of 5.
Total of Series of n terms 1 + 1 + 3 + 1 + 3 + 5 + 1 + 3 + 5 + 7 ……………………
What is the unit digit of 49 15?
What is the average of all the prime numbers which are less than 35?
A single reservoir supplies petrol to the whole city, and the reservoir is fed by a single pipeline filling the reservoir with a stream of uniform volum...