Ramu walks 3 km/hr while his brother Somu walks at 4km/hr. They both started school, which is 2 kms away from their house at 7:00 am. Then, which of these is correct?

see full answer

Your Exam Success, Personally Taken Care Of

1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.

An Intiative by Sri Chaitanya

Somu reaches school at 7:20 am

Somu reaches school 10 mins earlier than Ramu

Ramu reaches school at 7:30 am

All the above

answer is B.

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

Concept: Using the acceleration motion formula, a motion equation, determines how long Ramu and Somu each took. Compare the amount of time each took.
It is said that Ramu walks at the speed of 8km/hr. Similarly Somu walks at the rate of 4km/hr. Now both Ramu and Somu start walking at sharp 7:00 am.
The distance both Ramu and Somu have to walk to reach the school is 2km. Thus we know the distance traveled and their speed, so we need to find the time taken by Somu and Ramu to reach school. Let us first take the case of Ramu. We know the formula of acceleration motion,
${"mathml":"<math class="image_resized" style="width:288px;height:184px"><span style="font-family:$ As a result, Somu needs 30 minutes to go to the school. Ramu therefore needs 10 minutes longer to get to school at 7:30 am than Somu.
Hence, the correct option is 2.

Watch 3-min video & get full concept clarity