As measured in the frame of reference of the ground (of the target), the arrow fired from the archer that is on the train will have a higher speed. The clocks fire a laser pulse when the time is \(20\...As measured in the frame of reference of the ground (of the target), the arrow fired from the archer that is on the train will have a higher speed. The clocks fire a laser pulse when the time is 20 past four, and Alice observes both pulses arriving at her location at the same time, concluding that the pulses were emitted by the clocks at the same time.