Help me prove my boyfriend wrong with this problem?
"The record for the Kentucky Derby is held by Secretariat, who ran the 10 furlongs(1/8 of a mile) in 1 minute, 59.4 seconds. Calculate his average speed in km per hour."
I came up with 60.65 km/h and he came up with 4.25 km/h. I am almost sure I am correct but he was insisting that I didn't know what the heck I was doing.
Please let me know the correct answer & solution of this problem is so I can kick him in the bum!! :-)
Thanks!
Answer:
10 x .125 mile/119.4 sec x 60 sec/min x 60 min/hr x 1.60935 km/mile
= 60.65 km/hr
Here's your problem, your boyfriend is right if the race was only 1 eighth of a mile long because then old secratariat
did about a 16 minute mile P.S. I am old and fat and I waddle faster than that. I believe you meant the race was
1 and 1/4 miles long in which case your answer is closer to
the nags top speed.
kind hard huh
You can figure out which is correct without doing all the math.
8 furlongs is a mile. So the horse ran over a mile in 2 minutes. 1.6 km is a mile. So the horse ran over 1.6 km in 2 minutes. So to get from hours to minutes, you know you multiply the km by 60. which would bring the km's WAY over 4.25. So your boyfriend is wrong.
OR 10 furlongs = 2 km (as 1/8 mile = 200 metres)
3600 secs (1 hour) divided by 119.4 secs = 30.15
30.15 x 2 = 60.3
My km/mile conversion is rough, but you can see which answer is right. It's about 40 miles/hr.
10 furlongs = 2.01168 kilometer
1 minute & 59.4 seconds = 119.4 seconds = 0.033167 hours
2.01168 kilometers / 0.033167 hours = 60.6537 km/hr
10 furlongs = 2.01168 kilometer
1 minute & 59.4 seconds = 119.4 seconds = 0.033167 hours
since you know that average speed=total distance/time...
2.01168 kilometers / 0.033167 hours = 60.6537 km/hr
The answers post by the user, for information only, FunQA.com does not guarantee the right.
More Questions and Answers: