mensavehicle.php

<?php
	
	class Vehicle {
		private $speed;
		private $distance_travelled;
		private $time_taken;
		public function setSpeed($speed) {
			$this->speed = $speed;
		}
		public function travelTime($time) {
			$this->time_taken += $time;
			$this->distance_travelled += $this->getDistance($this->speed, $time);
		}
		public function isLevelWith(Vehicle $v) {
			return $v->getDistanceTravelled() == $this->getDistanceTravelled();
		}
		private function getDistanceTravelled() {
			return $this->distance_travelled;
		}
		public function dump() {
			printf("speed: %ukph\n", $this->speed);
			printf("distance_travelled: %ukm\n", $this->distance_travelled);
			printf("time_taken: %uh\n", $this->time_taken);
		}
		private static function getDistance($speed, $time) {
			return $speed * $time;
		}
	}
	
	$v1 = new Vehicle();
	$v1->setSpeed(60);
	
	$v1->travelTime(7/60);
	
	$v2 = new Vehicle();
	$v2->setSpeed(95);
	
	while (!$v1->isLevelWith($v2)) {
		printf("v1:\n");
		$v1->travelTime(1/60);
		$v1->dump();
		printf("\nv2:\n");
		$v2->travelTime(1/60);
		$v2->dump();
		printf("\n--\n");
	}