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Abhishek travelling at a speed of 12 km/hr reaches his home 20 minutes late. Had he travelled at 16 km/hr he would have been 20 min early. Find the distance Abhishek has to travel to reach his home.
24 km
28 km
36 km
30 km
32 km
24 km
28 km
36 km
30 km
32 km
Solution
Let the distance travelled by Abhishek to reach his home = d
Abhishek travelling at a speed of 12 km/hr reaches his home 20 minutes late.
Abhishek travelling at a speed of 16 km/hr reaches his home 20 minutes early.
∴ The distance travelled by Abhishek to reach his home is
d = 32 km
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Solution
Keynote
If a person travelling at a speed of ‘a km/hr’ reaches the desired destination m hours late and by travelling at a speed of ‘b km/hr’ reaches the desired destination n hours early, then the distance between the starting point and the desired destination is given by 
