A person covered a certain distance at some speed. Had he moved 6 km/h faster, he would have taken 30 minutes less. If he had moved 4 km/h slower, he would have taken 30 minutes more. What is his original speed (in km/h)?

A person covered a certain distance at some speed. Had he moved 6 km/h

1.	A person covered a certain distance at some speed. Had he moved 6 km/h faster, he would have taken 30 minutes less. If he had moved 4 km/h slower, he would have taken 30 minutes more. What is his original speed (in km/h)?
A.	21
B.	24
C.	28
D.	36
Answer» C. 28

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A person covered a certain distance at some speed. Had he moved 6 km/h faster, he would have taken 30 minutes less. If he had moved 4 km/h slower, he would have taken 30 minutes more. What is his original speed (in km/h)?

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