Question
A swimmer swims from point P against the current for 6
minutes and then swims back along the current for the next 6 minutes and reaches point Q. If the distance between P and Q is 120 m then the speed of the current (in km/ h) is:Solution
Let the speed of boat in still water =B and speed of stream =S then Given-Time in Upstream and Downstream =6 min And Distance between P And Q =120m Speed of boat in Downstream =B+S Speed of boat in Upstream=B-S ATQ- 6(B+S)-6(B-S) =120 6B+6S-6B+6S=120 12S =120 S=10×60/100 S= .6km/h
?2 + 114 - 48 ÷ 2 × 5 = 163
65% of ? = 50 + 20 × 4
What will come in the place of question mark (?) in the given expression?
30% of 520 + 16% of 1500 = ? + 244
390/? = √256 + 3.5
(43)² - (28)² + (32)² = ?% of 2500
What will come in the place of question mark (?) in the given expression?
(555 + 385 - 535) ÷ 15 X ? = 36 X 30
4261 + 8234 + 2913 + 8217 + 6283 + 4172 =?
√3600% of 150 + 3/5 of 360 - ? = 210
(32.1)² + (46.8)² - (28.8)² =? + 2257.97
(506 ÷ 22 + 9 × 3) × ? = 900 ÷ 9
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