try this--an average speed question?
607556
Everyone is wrong, it is 48MPH, think of it this way.  Lets say the distance is 60 miles, it takes 1.5 hours at 40, and 1 hour at 60, so a total of 2.5 hours, divide 120 by 2.5 and it is 48mph.  This will always be the answer reguardless of distance, whether 1 mile in each direction or a million miles in each direction.
440517
Ok ok...restate the question.  I'm a little slow right now.  What are you asking?
29068
pier_haringsma is correct.  You do not need any additional information.  Let \nD = total distance of the trip  \nD/2 = the distance the driver has gone so far\nT1 = amount of time he took to travel the first half of the trip\nT2 = the complete length of time of the whole trip (both halves).\n\n   Now, he wants the average ( D / T2 ) to equal 30.  His average so far is ( (D/2) / T1 ) = 15.\n\nD/T2 = 30, so D = 30*T2\n(D/2) / T1 = 15, so D = 30*T1\n\nD = 30*T1 = 30*T2, so T1 = T2.\n\n  So the driver wants the total time for the trip (BOTH halves), T2, to equal the time for the first half of the trip, T1.  This means he would have to travel the second half of the trip in no time, which is impossible.
297241
Average rate per hour = total distance / total time\n=( x + x )/ total time          (1)\nTime required to travel x distance at the speed of 10 miles\nper hour = x / 10 hours.\nTime required to travel x distance at the speed of 8 miles\nper hour = x / 8 hours.\nSo the total time is\n=(x / 10) + (x / 8)\n=18x/80 \n=\nPutiing this value in the denominator of (1)\nWe get\nAverage rate per hour = total distance / total time\n= 2x/[18x/80]\n=80/9\n=8.88\n=8.9 miles/hr\n\n( In general if the speeds are 'a' & 'b', the the average \nis given by their harmonic mean viz. 2*a*b/(a+b) )
531838
The question is.......how many licks does it take to get to you?
456275
9.81 m/s² or 32.2 ft/s²
140476
Speed and direction, if thats what you're asking
481716
distance = 160miles\nave. speed = 50mph\n\n160/50 = 3.2 hours or 3hours and 12 minutes\n\nfor the guy to arrive at exactly 11:30am\n\n(11:30) - (3hours12minutes) = 8:18am\n\nANSWER: 8:18am
685470
the speed = distance/time
133260
.68181818181818 etc. \n(a little more than 1/2 a foot per second)
141427
apparently not very quickly at all, sorry... why do you ask?
325948
It doesn't translate.  Some people are very quick...get to full speed in a hurry.  Others take more time, but reach faster speeds.  It is much like the Quarter Horse vs Thorobred.  Have I confused you enough?  I could go on....
177049
How fast is he walking?
893501
44.44444 mph.  If the distance of one leg is x miles, then you drove a total of 2x miles in (x/40 + x/50) hours.  Divide the total distance driven by the total time spent driving, and you get 200/9, or 44.444... mph
448583
what do you mean?\nhow to calculate their speed or wat?
861588
Average speed = (8+8.5)/2=16.5/2 = 8.25 m/s\nTotal distance = 8.25x99=816.75m\nTime taken for 1st Lap = 816.75/(2x8) = 51 sec\nTime taken for 2nd Lap = 816.75/(2x8.5) = 48 sec
697994
Impossible.\n\nVariance is Time. To get the average of 60 mph for 2 milels journey, you must know the time.\n2 miles/time= 60 mph\ntime = 2/60 *60 = 2 mins\nsince at 1st mile the train has traveled at 30mph. It has already spent 2 mins. So, it's not possible to get average of 60mph.