Question

A student covers 30 km at 15 kmph, 36 km at 36 kmph and 20 km of the remaining distance at 5 kmph. What is the total time taken to travel?
1. 7 hours
2. 8 hours
3. 6 hours
4. 4 hours

Answer 1

Correct Answer - Option 1 : 7 hours

Given:

Speed to cover 30 km = 15 kmph

Speed to cover 36 km = 36 kmph

Speed to cover 20 km = 5 kmph

Formula used:

Speed = Distance / time

1 kmph = 5/18 m/s

Calculation:

Calculating time taken by each segments

⇒ Segment 1: T1 = 30 / 15

⇒ T1 = 2 hours

⇒ Segment 2: T2 = 36 / 36

⇒ T2 = 1 hour

⇒ Segment 3: T3 = 20/5

⇒ T3 = 4 hours

Total time taken = 2 + 1 + 4

∴ Total time taken is 7 hours