How many 4-digit numbers can be formed from the digits 2,3,5,6,7 and 9 which are divisible by 3 and none are repeated?
Only that number is divisible by which the sum of all its digits is divisible by three. These numbers can be as follows- 2367 or 2379 or 2679 3567 or 3579 or 5679 Week Total way to make four-digit number divisible by 3- 4! +4! +4! +4! +4! +4! =6×4! =6×4×3×2×1=144.
A motor boat covers a certain distance downstream in a river in 4 hours. It covers the same distance upstream in 4 hours and 30 minutes. If the speed of...
Speed of a boat in still water is 15 kmph and speed of stream is 12 kmph. A man rows to a place at a distance of 81 km and come back to starting point. ...
When travelling downstream, a boat takes 6.25 hours to travel 225 km. If the speed of the stream is (1/3)rd of downstream speed of the boat, ...
Speed of a boat in still water is 15 kmph and speed of stream is 13 kmph. A man rows to a place at a distance of 56 km and come back to starting point. ...
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 boat can cover 145 km in downstream in 5 hours and 144 km in upstream in 8 hours. Find the speed of boat in still water.
Time taken by a boat to cover 253 km upstream is 49.99 % more than the time taken by the boat to cover 340 km downstream. Total time taken in covering b...
Sita can row 8 km/hr in still water. If it takes her three times as long to row up a river as it does to row down the same distance, find the speed of ...
Ratio of distance covered by boat in upstream to downstream is 4:3. Time taken in downstream and upstream is 2hr and 4 hr respectively. If speed of boa...
A boat takes half time in moving a certain distance downstream than upstream. The ratio of the speed of the boat in still water and that of the current...
