An individual is cycling at a speed of 30 km per hour. He catches his predecessor who had started earlier in three hours. What is the speed of his predecessor who had started 3 hours earlier?

Question: An individual is cycling at a speed of 30 km per hour. He catches his predecessor who had started earlier in three hours. What is the speed of his predecessor who had started 3 hours earlier?

Solution:
The distance covered in three hour = 3 × 30
= 90 km

Time taken by first individual = (3h + 3h) = 6h

Then, the speed of predecessor, = 90/6 kmph
= 15 kmph.