A student takes 1.25 hours to travel from home to school at a speed of 4 km/h. By what percentage should he increase his speed to reduce the time by 25% to cover the same distance from school to home ?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e 
%
Explanation:
Distance = time × speed = 1.25 × 4 = 5 km
Time reduce by 25% so time = 1.25 × 75/100 = 0.9375
Speed = distance/time = 5/0.9375 = 5.33
Increment in speed = 5.33 - 4 = 1.33
Percentage increment = (1.33)/(4) × 100 = %