Question
If 56 # 93 = 57 and 78 # 46 = 80, then 69 # 53 =
?Solution
3rd number: Sum of product of 1st and 2nd digit of 1st number and product of 1st and 2nd digits of 2nd number. 56 # 93 → {(5 x 6) + (9 x 3)} = {30 + 27} = 57 78 # 46 → {(7 x 8) + (4 x 6)} = {56 + 24} = 80 Similarly, 69 # 53 → {(6 x 9) + (5 x 3)} = {54 + 15} = 69
A train can cross a man standing on a platform of 300 metres length in 60 seconds and can cross the platform in 75 seconds. Find the length of the train.
Ratio of the lengths of two trains ‘X’ and ‘Y’ is 3:4 respectively and the ratio of time taken by them to cross a pole is 2:3 respectively. If s...
A train 260 meter long running with the speed of 75 kmph crosses a bridge in 18 seconds then what is the length of bridge?
A train crosses a 300-metre-long bridge in 20 seconds, and the same train crosses a tunnel twice the length of the bridge in 35 seconds. Find the speed ...
A train has 15 coaches and an engine. Each coach is 24 metres and the engine is 48 metres. Time taken by the train to cross a platform, whose length is ...
A train of length (L + 90) meters crosses a man running in the same direction in 30 seconds. The same train crosses a bridge of length (L - 210) meters ...
Two trains, each 100 meters long, are running in opposite directions. If one train's speed is twice that of the other and they take 10 seconds to cross ...
Two trains of same length are running in parallel tracks in the same direction with speed 56 km/hr and 110 km/hr respectively. The latter completely cro...
- Train X of length 180 m and Train Y of length 120 m are moving in opposite directions at 8 m/sec and 7 m/sec respectively. In how much time will they compl...
A train started from station P and preceded towards station Q at a speed of 98 km/h. 30 minutes later, another train started from station Q and preceded...
Relevant for Exams:
