Maths-
General
Easy
Question
The Bionic Woman gives Batman a 12 second start in a 2 kilometre race. If the Bionic Woman runs at 5 km/min, and Batman runs at 3 km/min, who will win the race and by how many seconds
The correct answer is: 4 seconds
Hint:
When two quantities of different units are compared and expressed as a ratio, it is known as Rate. For example, a car travels at a speed of 100 kilometres per hour, then it means in one hour it covers 100 kilometres.
The formula of speed is
speed = 
Solution
Step 1 of 2:
It is given that Batman is given an early start of 12 seconds. The average speed of the batman is 3 km/min.
Distance travelled by batman in 12 seconds = Speed × Time
= 3 km/min min 
= 
km
Distance remaining = 2 - km = 
km
Time taken by batman to travel km = 
= 
= 
min = 28 seconds.
Step 2 of 2:
The average speed of the batman is 5 km/min.
Time taken by batman to travel 2 km = 
= 
min = 24 seconds.
Bionic woman will the race by (28 - 24) 4 seconds.
Final Answer:
Hence, the bionic woman will race by 4 seconds.
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