Question
A boat can cover 120 km in upstream in 4 hours and 144
km in downstream in 3 hours. Find the speed of the stream.Solution
Downstream speed = 144/4 = 48 km/hr Upstream speed = 120/4 = 30 km/hr Speed of stream = (48 – 30)/2 = 9 km/hr
4, 5, 11, 34, 137, ?
216, 81, 297, 378, ?, 1035, 1728
What will come in place of (?) question mark in the given number series.
960, 960, 480, ?, 40, 8
What will come in place of the question mark (?) in the following series?
12, 13, 27, ?, 329, 1646
864, 432, 144, ? , 7.2, 1.2
What will come in place of the question mark (?) in the following number series?
29, 30, 33, ?, 69, 150
What will come in place of the question mark (?) in the following series?
47, 56, 120, 145, ?, 410
30          162        344        ?             890        1270
...70, 69, 73, 64,80, 55, ?
120, 136, 111, 147, ?, 162