SOLUTION: two lorries A and B ferry goods between two towns which are 3120km apart.lorry A travelled at 5km/hr faster than lorry B, and lorry b takes 4hrs more than lorry A to Cover the dist

Question 1100750: two lorries A and B ferry goods between two towns which are 3120km apart.lorry A travelled at 5km/hr faster than lorry B, and lorry b takes 4hrs more than lorry A to Cover the distance. calculate the speed of lorry B?
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
Let k be the speed of lorry B, and k+5 be the speed of lorry A. Then:
3120/k -4=3120/k+5
3120(k+5) -4(k)(k+5)=3120k
3120k+15600-4k�-20k=3120k
4k�+20k-15600=0
k�+5k-3900=0
(k-60)(k+65)=0
k=-65 or 60
We get a positive value of 60 kph for the speed of lorry B; and 65 kph for lorry A
☺☺☺☺
RELATED QUESTIONS
the distance between towns m and m is 280km, a car and a lorry can travel from m to n.... (answered by josgarithmetic)

THE DISTANCE BTW TOWNS M AND M IS 280KM, A CAR AND A LORRY CTRAVEL FROM M TO N. THE... (answered by richwmiller,josgarithmetic)

Hi Town A and B are 220km apart. A lorry driver and a taxi driver started off at the... (answered by josgarithmetic,greenestamps)

Please help me i'm weak in speed/distance chapter Ques1. Two drivers, Mike and Peter, (answered by Gogonati)

A and B are two lorry stations 600m apart. A fire station C in on the bearing 042° from... (answered by math_tutor2020)

At 8.15a.m, a van started from Town X heading for Town Y at a constant speed of 50km/h.... (answered by Edwin McCravy)

Hi point A is 450km away from point B. A lorry is travelling from A to B . At the same (answered by ikleyn)

pls. help me solve this prob. tnx. prob.1. A car and a lorry set off on a 390-km... (answered by stanbon)

Two trucks traveled from Town A to Town B which are 100km apart. One of the trucks... (answered by ikleyn)