Question
Average of 8 numbers is 18. If 26 is replaced by 14,
find the new average.Solution
ATQ, Original sum = 8×18 = 144 New sum = 144 − 26 + 14 = 132 New average = 132/8 = 16.5
A boat’s speed in still water is 1.5 times the speed of the current. It takes the boat 22.5 hours to travel 90 km upstream. If ...
A boat can travel 36 km upstream and 54 km downstream in 9 hours. If the speed of the boat in still water is 3 times the speed of the stream, find the s...
A boy can swim a certain distance downstream in 5 hours and return in 7 hours. If the rate of stream is 4 kmph then what is the speed of boy in still wa...
A motorboat completes 36 km upstream and 96 km downstream together in 7 hours. If its speed in still water is 12 km/h more than the stream, determine th...
The ratio of the speed of boat ‘A’ in still water, the speed of boat ‘B’ in still water and the speed of the current is 8:6:2, respectively. If ...
- A boat takes the same amount of time to travel (x – 24) km upstream as it takes to cover (2x – 84) km downstream. If the speed of the boat is 12 km/h a...
A man can row at 36 km/hr in still water. In a stream which is flowing at 12 km/hr, it takes him 3 hrs to a place and back. How far is the place?
A boat can cover a distance of 210 km downstream with the current in 5 hours. It takes an additional 2.5 hours to return the same...
The ratio of speed of the boat and the speed of the current is 6:5. If the downstream speed of the boat is 44 km/hr. Then find how much distance will th...
A boat's speed in calm water exceeds the speed of the current by 12 km/hr. Given that the current's speed is 1.25x km/hr and the boat takes 5 hours to t...
Relevant for Exams:
