Question

A bike running at a speed of 50 km/h reaches its destination 10 minutes late. If it runs at 60 km/h it is late by 5 minutes. How many minutes should the bike take, travelling at usual speed to complete the journey on the same route to reach on time?

• A. 15 minutes
• B. 25 minutes
• C. 20 minutes
• D. 12 minutes

Answer 1

Answer:

C. 20 minutes

distance is same

$50\times(t+10)=60\times(t+5)$

$5t+50=6t+30$

$t=20$

$20 min$