30, 81, ?, 693, 2070, 6201, 18594
Find the missing term in the series.30, 81, ?, 693, 2070, 6201, 18594
A clock only with only dots marking 3, 6, 9 and 12 positions has been kept upside down in front of mirror. A person reads the time in the reflection of the clock as 4.50. What is the actual time?
A train moving at speed of 90 km/hr crosses a pole in 7 seconds. Find the length of the train.