Question
A boat can travel 36 km upstream in 6 hours. The same
boat can travel 63 km downstream in 3 hours. What is the speed of the boat in still water?Solution
Upstream speed = 36 km / 6 hours = 6 km/h. Downstream speed = 63 km / 3 hours = 21 km/h. Let the speed of the boat in still water be B km/h and the speed of the stream be S km/h. Upstream speed = B − S = 6 km/h. Downstream speed = B + S = 21 km/h. Adding the two equations: 2B = 27 ⇒ B = 13.5 km/h. Ans. b
23 45 89 155 ? 353
580 557 528 497 ? 419
(14.073)² + (32.103)² + (43.9653)² + (52.983)² + ? = (102.45)² + (98.007)²
Complete the series choosing the missing number.
110, 99, 86, ___, 54, 35.
The question below is based on the given series I. The series I satisfy a certain pattern, follow the same pattern in series II and answer the questions...
What will come in place of the question mark (?) in the following series?
17, 81, 131, 169, 197, ?
226  231   466  ?  5606  28031    Â
10, 10, 15, 30, 75, ?
What will come in place of the question mark (?) in the following series?
72, 78, 90, ?, 132, 162
What will come in the place of questions (?) mark in the following questions.
1204, 1218, ? , 1267, 1302, 1344
