- 1.5 hrs
- 1.8 hrs
- 1.2 hrs
- 2 hrs

Option 1 : 1.5 hrs

**Given:**

Time to cover 36 km = 45 mins

increase = 4 km/h

Distance to travel = 78 km

**Formula used:**

Speed = distance/time

**Calculation:**

45 min = 3/4 hrs

Initial speed = 36/(3/4) = 48 km/h

Speed after increase = 52 km/h

T = 78/52 = 3/2 = 1.5 hrs

**∴ The time taken will be 1.5 hrs.**

India’s **#1 Learning** Platform

Start Complete Exam Preparation

Daily Live MasterClasses

Practice Question Bank

Mock Tests & Quizzes

Trusted by 2,20,07,562+ Students

Testbook Edu Solutions Pvt. Ltd.

1st & 2nd Floor, Zion Building,

Plot No. 273, Sector 10, Kharghar,

Navi Mumbai - 410210

[email protected]
Plot No. 273, Sector 10, Kharghar,

Navi Mumbai - 410210

Toll Free:1800 833 0800

Office Hours: 10 AM to 7 PM (all 7 days)