Depends on how long they were biking for and what gear the bike was in. Also how much the kid weights, more you weight, they more effort when into it, and more calories burned. Go to the website below to find out more.
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This depends on several factors such as weight, velocity, and time. A "moderate" ride is subjective to your own fitness. As a competitive cyclist, I will burn around 1500-2k calories on what I would consider a moderate ride. However that may be different for you. I would suggest using bikecalculator.com to get a rough estimate of what you may be burning in your workout. It will help to know the amount of time, speed, and distance your are traveling. Or if you have a smartphone, you can try sites like Strava.com or Mapmyride.com for a gps application which will collect and estimate data for you, including calories burned.
You will burn 250-800 calories per hour depending on how fast and how many miles you ride a bike.