Dhaka and Mymensingh apart from each other 760 km. A train starts from Dhaka at 9 am and travels towards Mymensingh at speed 60 km/hr. Another train starts from Mymensingh at 10 am and travels towards Dhaka at speed 80 km/hr. At what time both will meet?

Question: Dhaka and Mymensingh apart from each other 760 km. A train starts from Dhaka at 9 am and travels towards Mymensingh at speed 60 km/hr. Another train starts from Mymensingh at 10 am and travels towards Dhaka at speed 80 km/hr. At what time both will meet?

Solution:
Total distance between D and M = 760 km.
A travels 1 hour before B so it travels = 60 × 1 = 60 km
Now the remaining distance D and M= 760 - 60 = 700 km
Relative speed = 60 + 80 = 140 km/hr

Time = 700/140
= 5 hour.

So, the time when they meet = 10 am + 5 hour = 3 pm