A boat sails down the river for 10 km and then up the river for 6 km. The speed of the river flow is 1 km/h. What should be the minimum speed of the boat for the trip to take a maximum of 4 hours?

2 kmph

No worries! We‘ve got your back. Try BYJU‘S free classes today!

3 kmph

No worries! We‘ve got your back. Try BYJU‘S free classes today!

4 kmph

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

5 kmph

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is C 4 kmph
$\frac{D_{1}}{S_{B} + S_{S}} + \frac{D_{2}}{S_{B} - S_{S}} = 4 h o u r \frac{10}{S_{B} + 1} + \frac{6}{S_{B} - 1} = 4 h o u r Going by option and (i) we get, S_{B} = 4 k m / h o u r$

Suggest Corrections

Similar questions

Join BYJU'S Learning Program