只有测试点8，9,10WA，请各位指点迷津

代码

#include<iostream>
using namespace std;
int main() {
	unsigned int s, v,t2,t3,t4;//初始化s和v，t2是出发时间，t3是小时，t4是分钟
	cin >> s >> v;
	double t = double(s) / v;
	if (t != int(t)) { t = int(t) + 11; }
	else { t = t + 10; }//花费时间
	
	t2 = 8 * 60 - t;
	if (t2 < 0) { t2 = 24 * 60 + t2; }
	t3 = t2 / 60;
	t4 = t2%60;
	printf("%02d:%02d", t3, t4);
	return 0;
}

#include<iostream>
using namespace std;
int main() {
	unsigned int s, v,t2,t3,t4;//初始化s和v，t2是出发时间，t3是小时，t4是分钟
	cin >> s >> v;
	double t = double(s) / v;
	if (t != int(t)) { t = int(t) + 11; }
	else { t = t + 10; }//花费时间
	
	t2 = 8 * 60 - t;
	if (t2 < 0) { t2 = 24 * 60 + t2; }
	t3 = t2 / 60;
	t4 = t2%60;
	printf("%02d:%02d", t3, t4);
	return 0;
}