How many hurdles in a 75metre race in 13-14 year olds?

What technology do table tennis use? What is a baseline player? A student prepares a standardized solution of sodium hydroxide that is about 0.1 M and stores it in a plastic bottle. Why is a plastic bottle generally preferred to a glass bottle to store NaOH? Is a mongoose faster than a cheeta? Which one would compress more a solid rubber bicycle or a inflated mountain bike tire? What are the recommended tire specifications for a bicycle with a wheel size of 26x2.125? What is the average time to run a 12k race? What are the benefits of upgrading to a DT Swiss hub on your bicycle? What are the best practices for maintaining and replacing a presta bike tube? What should you do as a driver of a car in regards to a bicyclist to ensure their safety on the road? Why is it an advantage for a mountain bike to have a lower cross-bar? How can I ride a bike without using my hands? How do you properly adjust and maintain bicycle hand brakes for optimal performance and safety? Does processor 428 have pins or holes? What is the name of an early human -powered bicycle? What are the best practices for maintaining and replacing bike intertubes? How much force would be required to hold the bicycle up off of the ground but at rest? Who are the top 10 women badminton players? What was last used at Wimbledon 1987? What is the maximum score in badminton in double?