The speed of a cyclist is 12 km / h, which is 3 times the speed of a pedestrian, but 6 times less than the speed of a bus.

The speed of a cyclist is 12 km / h, which is 3 times the speed of a pedestrian, but 6 times less than the speed of a bus. Find the speed of the pedestrian and the bus.

Since the cyclist’s speed is 3 times the walking speed, the walking speed will be the ratio of the cyclist’s speed to the difference.
We get:
12/3 = 4 km / h (pedestrian speed).
Since the speed of the bus is 6 times the speed of the cyclist, the speed of the bus is equal to the product of the speed of the cyclist and the difference.
We get:
12 * 6 = 72 km / h (bus speed).
Answer: Pedestrian speed 4 km / h, bus speed 72 km / h.