Question
A person travels between three towns as follows:
type="disc"> From Town X to Town Y, he covers 120 km at 60 km/h. From Town Y to Town Z, he covers 150 km at 75 km/h. On the return trip: From Town Z to Town Y, he travels at 50 km/h. From Town Y to Town X, he travels at 40 km/h. What is the average speed for the entire journey? 50 km/hSolution
Time taken by person from town X to town Y = 120/60 = 2 hours Time taken by person from town Y to town Z = 150/75 = 2 hours Time taken by person from town Z to town Y = 150/50 = 3 hours Time taken by person from town Y to town X = 120/40 = 3 hours 
105   107   111   114   ?   127
8 6 2 ? -1 9.5
...64Â Â Â 48Â Â Â 36Â Â Â 22Â Â Â Â 16Â Â Â Â 8
(45)2 ÷ ∛729 + (35)2 ÷ 1.4 =?
24, 33, 50, ?, 108, 149
16 4 2 1.5 1 1.875
...Find the wrong number in the given series.
3 1.5 1.5 ? 4.5 11.25
...18Â Â Â Â Â Â Â Â Â Â 434Â Â Â Â Â Â Â Â 642Â Â Â Â Â Â Â Â 746Â Â Â Â Â Â Â Â 798Â Â Â Â Â Â Â Â ?
...720    ?     240     180      144     120
...If  204    196       223   x  284
Then, what is the average of the numbers of the above series?
...
