Question
Find the time taken by boat D to cover downstream
distance, if the total time taken to complete the journey is 12.5 hours?Solution
Speed of boat D in still water = 6 km/hr Speed of stream = 2 km/hr Total time taken by boat D for entire journey = 12.5 hours Let, total distance travelled by boat D = d kms Upstream distance = 66% of d = kms Downstream distance = kms  Upstream speed = 4 km/hr Downstream speed = 8 km/hr Total time taken by boat D = Time taken for upstream + time taken for downstream + = 12.5 On solving the above equation, we get, d = 60 kms Downstream distance = = 20 kms Time taken = = 2.5 hours
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...What will come in place of the question mark (?) in the following series?
81, 83, 87, 95, 111, ?
48, 24.5, ?, 39.75, 81.5, 206.25, 621.75
What value should come in the place of (?) in the following number series?
14, 18, ?, 43, 68, 104
14, 20, 29, 44, 65, ?
16, 16, 32, 96, ?, 1920
What will come in place of (?) Question mark in the given number series.
500, 489, 467, 434, 390, 335, ?
72, 79, 100, 135, 184, ?
79Â Â Â Â Â 86Â Â Â Â Â Â 76 Â Â Â Â Â Â 89Â Â Â Â Â Â 73 Â Â Â Â Â Â ?
...290, 571, 900, ?, 1485, 1890
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