That's nice.
Have a question?
PQ + QS = 14
PQ/PS = PR/PT due to similarity
8/14 = PR / 10.5
10.5 ( 8/14) = PR
PR = 6 units
Chris can probably tell you that 'crawfish' are also known as 'crawdads' ....or 'MudBugs' in Louisiana !
....and Basic /advanced/particle/theoretical/astro Physics, Chemistry, Statics, Dynamics, Electricity and circuits, Mechanics of Materials, Electromagnetics and maybe a smidge of Thermodynamics.....
HaHa .... JK
Well..... Thanx ! But really, it was nothing special compared to your insightful and thoughtful postings.....you add so much to the conversation, we could not do without you.
Since 5 mph current is flowing AGAINST your 12 mph speed, your NET speed is 12-5 = 7 MPH
31 miles / 7 mi/hr = 4.4286 hr = 4 hr 25.71 min
....if you don't include the YEAR .... Makes me wonder why they specified ' 2007 '....... Just wonderin'..... ~ EP
.....BUT it says that you push 5 buttons AT THE SAME TIME ....at ONCE, so there is no sequencing involved.....SO I think YOUR ANSWER is the correct one. ~EP
Another look:
Possible combinations 1 2 3 4 5
2 3 4 5 6
1 3 4 5 6
1 2 4 5 6
1 2 3 5 6
Only SIX combintaions are possible since you push FIVE of the buttons down at ONCE
So you have a 1 out of 6 chance of getting it correct (as Cphil found)
P = 30 . 97696 x 4 = 123.9078
O=15.9994 x 6 =95.9964
123.9078 / (123.9078 +95.9964) * 1099.45 = 619.498 gm of P