A cyclist travels at an average speed of 30 mph for 4 hours. The return trip, more uphill terrain, took 6 hours. What was his average rate of speed on the return?
2007-04-30 19:20:39 · 12 answers · asked by Vanity6 1 in Science & Mathematics ➔ Mathematics
I think the answer is twenty. I took 30 by 4 and got 120. Then I divided that by six because he has go to 120 to and fro. 120 divided by six is 20. It's been a while since I've had these.
2007-04-30 19:24:36 · answer #1 · answered by newy0rkbabygirl 4 · 0⤊ 0⤋
We need to know how far the cyclist went:
Distance = Rate * Time
Distance = 30 (miles/hr) * 4 hr = 120 miles.
On the way back, the cyclist went 120 miles in 6 hours.
Rate = distance / time
Rate = 120 miles / 6 hours
Rate = 20 miles / hr
The cyclist's average rate on the return trip was 20 mph.
2007-04-30 19:28:56 · answer #2 · answered by theoryofgame 7 · 0⤊ 0⤋
Speed = distance / time
Distance = speed x time
The distance the cyclist travelled is
d = 30 mph x 4 h = 120 miles
Average speed when he returned
S = 120 miles/ 6 hours
S = 20 miles/hour
S = 20mph ===> his average speed on his return
2007-04-30 19:32:13 · answer #3 · answered by detektibgapo 5 · 0⤊ 0⤋
the distance travel by the cyclist with v = 30mph and t = 4 is
d = vt = 30*4 = 120miles.
he covered the same distance on return trip, therefore, if it took 6 hours, the cyclists' average rate of speed on the return is, v = d/t = 120/6 = 20mph
2007-04-30 19:28:40 · answer #4 · answered by michael_scoffield 3 · 0⤊ 0⤋
Speed = Distance / Time
Distance = 30 x 4 = 120
Time = 6
Speed = 120 / 6 = 20
Ans: 20 mph
2007-04-30 19:24:54 · answer #5 · answered by Anonymous · 1⤊ 0⤋
20
2007-04-30 19:25:09 · answer #6 · answered by odacrem69 3 · 0⤊ 0⤋
r * t = d rate * time = distance
going 30 miles/hour * 4 hours = 120 miles
return x miles/hour * 6 hours = 120 miles
x = 20 mph
2007-04-30 19:24:26 · answer #7 · answered by trichbopper 4 · 1⤊ 0⤋
We know that the distance is the same.
d=rt
1st trip distance = 2nd trip distance
30(4) = r(6) simply & solve for r
120 = 6r
120/6 = 6r/6
20 = r
20 mph is your answer
2007-04-30 19:25:42 · answer #8 · answered by SusanB 5 · 0⤊ 0⤋
20 mph
2007-04-30 19:25:39 · answer #9 · answered by EZMZ 7 · 0⤊ 0⤋
If something is 40% smaller, you merely subtract 40%. So 40% of 40 energy is 16: you do this through multiplying 40 through 0.4. the answer might want to be 40 - 16 = 24 A shorter way might want to easily be to multiply through 40 through 0.6, considering that it really is a million-0.4.
2016-12-05 03:55:53 · answer #10 · answered by ? 4 · 0⤊ 0⤋