A man drove for 4 hours at a certain speed, he then doubled his speed and drove for another 3 hours. Although he covered 600 kilometers. At what speed did h...

Assessment: JAMB UTME - Mathematics - 1983 Subject: General Mathematics

Question 1 Report

A man drove for 4 hours at a certain speed, he then doubled his speed and drove for another 3 hours. Although he covered 600 kilometers. At what speed did he drive for the last 3 hours?
Answer Details
Speed =  d i s t a n c e t i m e
let x represent the speed, d represent distance
x =  d 4
d = 4x
2x =  600 − d 3
6x = 600 - d
6x = 600 - 4x
10x = 600
x =  600 10
= 60km/hr

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