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<h2 class="mb-4 text-center text-primary">
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<label for="distance" class="form-label">Distance (in kilometers):</label>
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<h2 class="mb-3 text-primary">What is a Speed Calculator?</h2>
<p>
A speed calculator is a simple tool that helps you determine how fast you're traveling based on the distance covered and the time it took. The most common unit of speed is kilometers per hour (km/h), but other units like miles per hour (mph) or meters per second (m/s) can also be used.
</p>
<h3 class="mt-4 text-secondary">How Does This Speed Calculator Work?</h3>
<ul>
<li><strong>Distance (in kilometers)</strong></li>
<li><strong>Time (in hours and minutes)</strong></li>
</ul>
<p>
Then it applies the basic speed formula:
</p>
<blockquote class="blockquote bg-light p-3 border-start border-4 border-primary">
<strong>Speed = Distance ÷ Time</strong>
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<p>Results are calculated live as you enter your values.</p>
<h3 class="mt-4 text-secondary">Why Use a Speed Calculator?</h3>
<p>This tool is useful for:</p>
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<li>Estimating travel time</li>
<li>Calculating running, biking, or walking speed</li>
<li>Physics homework</li>
<li>Fleet or delivery tracking</li>
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<h3 class="mt-4 text-secondary">Speed Unit Reference</h3>
<ul>
<li>1 km/h ≈ 0.621 mph</li>
<li>1 km/h ≈ 0.278 m/s</li>
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<h3 class="mt-4 text-secondary">FAQ</h3>
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The formula is simple: <strong>Speed = Distance ÷ Time</strong>. Make sure time is in hours for km/h results.
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Yes! This tool works great for calculating any average speed over a known distance and time.
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}</style>
<!-- Real-Time Speed Script -->
<script>
function calculateSpeed() {
const distance = parseFloat(document.getElementById('distance').value);
const hours = parseFloat(document.getElementById('hours').value);
const minutes = parseFloat(document.getElementById('minutes').value);
const resultDiv = document.getElementById('speedResult');
if (isNaN(distance) || isNaN(hours) || isNaN(minutes)) {
resultDiv.classList.add('d-none');
resultDiv.textContent = '';
return;
}
if (distance <= 0 || (hours === 0 && minutes === 0)) {
resultDiv.classList.remove('d-none');
resultDiv.classList.replace('alert-info', 'alert-warning');
resultDiv.textContent = "Please enter a valid distance and time.";
return;
}
const totalHours = hours + (minutes / 60);
const speed = distance / totalHours;
resultDiv.classList.remove('d-none');
resultDiv.classList.replace('alert-warning', 'alert-info');
animateSpeed(speed.toFixed(2));
}
function animateSpeed(finalValue) {
const resultDiv = document.getElementById('speedResult');
let start = 0;
const end = parseFloat(finalValue);
const duration = 500;
const increment = end / (duration / 20);
const timer = setInterval(() => {
start += increment;
if (start >= end) {
start = end;
clearInterval(timer);
}
resultDiv.textContent = `Speed: ${start.toFixed(2)} km/h`;
}, 20);
}
// Attach real-time listeners
['distance', 'hours', 'minutes'].forEach(id => {
document.getElementById(id).addEventListener('input', calculateSpeed);
});
</script>
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