speed        time       distance    EQUATIONS
NORMAL           r            t          d          rt=d
FASTER          r+30         t-2.5       d          (r+30)(t-2.5)=d
SLOWER          r-10         t+2.5       d          (r-10)(t+2.5)=d


Additional equation might help:          (r+30)(t-2.5)=(r-10)(t+2.5)

Original speed:  km/h 

RELATED QUESTIONS

A man covers a certain distance on scootr. Had he moved 3kmph faster, he would have taken  (answered by ankor@dixie-net.com,happyhaps)

a man covers a certain distance on scooter.had he moved 3 kmph faster, he would have... (answered by josgarithmetic,richwmiller)

A man walks a certain distance at a certain speed. Had he walked 1/2 km / hr faster, he... (answered by ankor@dixie-net.com)

A man walk a certain distance at certain rate. Had he walked 1/2 km an hour faster he... (answered by ankor@dixie-net.com)

If a student had walked 1km/hr faster, he would have taken 15 minutes less to walk 3 km.... (answered by dfrazzetto)

A man walks a certain distance at a certain rate. Had he walked 1/2 km per hour faster,... (answered by ankor@dixie-net.com)

problem 1:


A cyclist, riding steadily from his hometown, reached his destination in... (answered by Theo,mccravyedwin,Edwin McCravy)

A man drives 108 km at an average rate. If he had driven 5 km/hr. faster, he would have... (answered by ptaylor)

Can someone help me solve this problem?

Steve traveled 150 miles at a certain speed.... (answered by RAY100)