Passage

Directions: Read the following information and answer the question that follows: Arjun can beat Amit by 15 metres in a 100-m race, whereas Ravi is 20% slower than Amit. Ashwani, whose speed is 3 m/sec, beats Arjun by 15 seconds in a 150-m race. If Ashwani and Ravi run a 100-m race, Ashwani beats Ravi by x metres.

If the downstream time of boat is x% less than upstream time of boat, then the speed of boat is what percent more than speed of stream?