A biker covered half the distance between two towns in 2 hr 30 min. After that he increased his speed by 2 km/hr. He covered the second half of the distance in 2 hr 20 min. Find the distance between the two towns and the initial speed of the biker.	Choose the most appropriate option
A) 248
B) 140
C) 287
D) 167
E) 111
Let x km/hr be the initial speed of the biker, then his speed during the second part of the trip is x + 2 km/hr. Half the distance between two cities equals 23060⋅x23060⋅x km and 22060⋅(x+2)22060⋅(x+2) km. From the equation: 23060⋅x=22060⋅(x+2)23060⋅x=22060⋅(x+2) we get x=28x=28 km/hr.   The intial speed of the biker is 28 km/h.   Half the distance between the two towns is   2h30min×28=2.5×28=702h30min×28=2.5×28=70.   So the distance is 2×70=1402×70=140 km.   Answer:140
<result>B</result>
A biker covered half the distance between two towns in 2 hr 30 min. After that he increased his speed by 2 km/hr. He covered the second half of the distance in 2 hr 20 min. Find the distance between the two towns and the initial speed of the biker.