Q1Single correct1 Mark4 Jan 2026

Two buses travel between Jamshedpur and Kolkata in the opposite directions, on the same road. On that road, the maximum allowed speeds are different (but constant) for the opposite directions. Usually, both buses travel at the respective maximum allowed speeds to their respective destinations: the bus from Jamshedpur to Kolkata takes 4 hours, while the bus from Kolkata to Jamshedpur takes 3 hours. One day, the two buses start at the same time. However, one hour after starting, the bus from Jamshedpur to Kolkata reduces its speed to half of its maximum allowed speed due to congestion on the road. If both buses do not stop anywhere in between, how many hours after starting do they meet?

A

2 hours

B

$\frac{23}{12}\text{ hours}$

C

$\frac{12}{5}\text{ hours}$

D

$\frac{21}{11}\text{ hours}$

E

$\frac{10}{11}\text{ hours}$