. Melvin who decided to go to weekend trip should not exceed 8 hours driving in a day. The average speed of forward journey is 40 miles/hr.Due to traffic on sundays, the return journey's average speed is 30 m/h. How far he can select a picnic spot?
a) 120 miles
b) between 120 and 140 miles
c) 160 miles
2006-07-08 21:44:30 · 4 answers · asked by isowonder 1 in Education & Reference ➔ Other - Education
with solution
2006-07-08 21:56:42 · update #1
x=time driven at a particular speed
40 mph * x hours = 30 mph * (8-x) hours
40 x = 240 miles - 30x
70x = 240
x=3.428571
Distance on the way there= 40 mph * 3.428571 hours (3 hours 25 minutes 43 seconds)
Distance on the way there = 137 .14 miles
Distance on the way home = 30 mph * (8 - 3.428571) hours
Distance on the way home = 30 mph * 4.571429
Distance on the way home = 137.14 miles.
So, the answer is B) Between 120 and 140 miles
2006-07-10 11:21:06 · answer #1 · answered by Tom S 3 · 0⤊ 0⤋
120 miles
2006-07-08 21:48:26 · answer #2 · answered by indian beauty 4 · 0⤊ 0⤋
If you mean eight hours total driving time, the answer is (b). But eight hours in a day is 35mph x eight hours which would be 280 miles.
2006-07-08 21:54:18 · answer #3 · answered by Spillski 3 · 0⤊ 0⤋
is it the answer in 'b'
2006-07-08 21:50:28 · answer #4 · answered by koolbvr 2 · 0⤊ 0⤋