Bhanu travels from City A to City B, If Bhanu drives his car at of his normal speed, then he reaches City B 28 minutes late. Find the time (in minute) that Bhanu would have taken to travel from City A to City B if he drove at his normal speed.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 21.
Let normal time = x minutes
At 3/7 of normal speed, time becomes (7/3)x
Delay = (7/3)x − x = 28
⇒ (7x − 3x)/3 = 28
⇒ 4x/3 = 28
⇒ x = (28 × 3)/4 = 21 minutes