Question

The distance between two cities a and b is 330 km. A train starts from a at 8 a.M. And travel towards b at 60 km/hr. Another train starts from b at 9 a.M. And travels towards a at 75 km/hr. At what time will they meet

Answer 1

train a will travel 60 km in 1 hr...so at 9 am it will cover 60 and the distance beween a & b will be 330-60 =270

now...both trains start at 9 am towards each other..so derived  speed is (60+75) = 135 km/hr

speed =dist/time  so 135 = 270/time

hence time =2hrs

so..trains will meet at 9+2 =11 am

Answer 2

Answer:

Step-by-step explanation:

Total distance between A and B=330km/ht.

∵ A start from A at 8.00a.m and B at 9.00a.m  

Time span=1hour.

∴ Distance traveled by A in 1hr=60km.

Now distance left when B will start=(330−60)km =270km

Relating speed of train A and B =60km/hr+75km/hr

=135km/hr

(Speed added because both train traveled towards each others.)

∴ Time taken to meet A and B=  

135km/hr

270km

​  

=2hr

∴ Both train meets at=9a.m+2hr=11a.m